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In virtual environment populated with flit install -s (editable), python3 -m pip freeze raises AssertionError on MacOS #8996

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tombaker opened this issue Oct 14, 2020 · 11 comments · Fixed by #9050
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C: direct url Direct URL references (PEP 440, PEP 508, PEP 610) C: editable Editable installations C: freeze 'pip freeze' related type: bug A confirmed bug or unintended behavior

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@tombaker
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Environment

  • pip version: 20.2.3
  • Python version: 3.8
  • OS: MacOS 10.15.7 and Ubuntu 20.04 (tested on two different machines)

I created the virtual environments with python3 -m venv ... and populated them with flit install -s (which installs a local script as "editable" analogously to python3 -m pip install --editable ..

Description

When I run `python3 -m pip freeze' within the virtual environment, the following exception is raised:

ERROR: Exception:
Traceback (most recent call last):
  File "/Users/tbaker/venvs/dcapenv/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 228, in _main
    status = self.run(options, args)
  File "/Users/tbaker/venvs/dcapenv/lib/python3.8/site-packages/pip/_internal/commands/freeze.py", line 101, in run
    for line in freeze(**freeze_kwargs):
  File "/Users/tbaker/venvs/dcapenv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 67, in freeze
    req = FrozenRequirement.from_dist(dist)
  File "/Users/tbaker/venvs/dcapenv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 257, in from_dist
    req = direct_url_as_pep440_direct_reference(
  File "/Users/tbaker/venvs/dcapenv/lib/python3.8/site-packages/pip/_internal/utils/direct_url_helpers.py", line 49, in direct_url_as_pep440_direct_reference
    assert not direct_url.info.editable
AssertionError

@sbidoul @chrahunt I note that this assertion error was introduced a few months ago (see #7612).

Expected behavior

I expected pip to display a list of installed modules, as it does when I run pip 20.2.3 within virtual environments created prior to mid-August, e.g.:

alabaster==0.7.12
appdirs==1.4.4
astroid==2.4.2
attrs==19.3.0
Babel==2.8.0
black==19.10b0

How to Reproduce

  1. Go to a Github repo with a Python script under development - or clone the small project mklists that I used for this test (and note its pyproject.toml.
  2. Create a virtual environment, e.g.: python3 -m venv .venv
  3. Activate the virtual environment, e.g.: source .venv/bin/activate (MacOS) or . .venv/bin/activate (Ubuntu)
  4. Install flit: python3 -m pip install --upgrade flit
  5. Run flit install -s to install the local code as "editable".
  6. Run python3 -m pip freeze.
  7. Instead of displaying a list of installed modules, an exception is raised (as described above).

Output (MacOS)

577 [master] ~/github/tombaker/mklists> python3 -m venv .venv

578 [master] ~/github/tombaker/mklists> source .venv/bin/activate

(.venv) 579 [master] ~/github/tombaker/mklists> python3 -m pip install --upgrade flit
Collecting flit
  Using cached flit-3.0.0-py3-none-any.whl (48 kB)
... etc ...
Successfully installed certifi-2020.6.20 chardet-3.0.4 docutils-0.16 flit-3.0.0 flit-core-3.0.0 idna-2.10 pytoml-0.1.21 requests-2.24.0 urllib3-1.25.10
WARNING: You are using pip version 20.2.1; however, version 20.2.3 is available.
You should consider upgrading via the '/Users/tbaker/github/tombaker/mklists/.venv/bin/python3 -m pip install --upgrade pip' command.

(.venv) 580 [master] ~/github/tombaker/mklists> python3 -m pip install --upgrade pip
...
Successfully installed pip-20.2.3

(.venv) 581 [master] ~/github/tombaker/mklists> flit install -s
Extras to install for deps 'all': {'test', 'doc', '.none'}                                                                                                           I-flit.install
Installing requirements                                                                                                                                              I-flit.install
Collecting pytest
  Using cached pytest-6.1.1-py3-none-any.whl (272 kB)
... etc ...
Successfully installed Jinja2-2.11.2 MarkupSafe-1.1.1 ... etc ...
Symlinking mklists -> /Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/mklists                                                                I-flit.install
Writing script to /Users/tbaker/github/tombaker/mklists/.venv/bin/mklists                                                                                            I-flit.install

(.venv) 582 [master] ~/github/tombaker/mklists> python3 -m pip freeze
ERROR: Exception:
Traceback (most recent call last):
  File "/Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 228, in _main
    status = self.run(options, args)
  File "/Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/pip/_internal/commands/freeze.py", line 101, in run
    for line in freeze(**freeze_kwargs):
  File "/Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 67, in freeze
    req = FrozenRequirement.from_dist(dist)
  File "/Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 257, in from_dist
    req = direct_url_as_pep440_direct_reference(
  File "/Users/tbaker/github/tombaker/mklists/.venv/lib/python3.8/site-packages/pip/_internal/utils/direct_url_helpers.py", line 49, in direct_url_as_pep440_direct_reference
    assert not direct_url.info.editable
AssertionError

Note

On 13 October, I described this issue on Stackoverflow

@tombaker tombaker changed the title In vrtual environment populated with flit install -s (editable), python3 -m pip freeze raises AssertionError on MacOS In virtual environment populated with flit install -s (editable), python3 -m pip freeze raises AssertionError on MacOS Oct 14, 2020
@sbidoul
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sbidoul commented Oct 14, 2020

@tombaker thanks for the report. I think that's a combination of flit generating the editable flag in direct_url.json (which is correct) and pip beeing confused because flit's notion of editable is not recognized by pip. Perhaps this assert should be replaced with a warning or nothing at all. I'll look into this.

@tombaker
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@sbidoul I'm just now seeing your response. In the meantime, I posted an issue on the Flit repo pointing out that pip freeze works in virtual environments populated using Flit 2.3.0 but not in environments populating using Flit 3.0.0.

@takluyver
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Flit 2.x didn't do anything about the direct_url info - @sbidoul added it for 3.0. So no surprise that only Flit 3 causes this. I'll trust Stéphane on what needs changing. 🙂

@pradyunsg pradyunsg added C: direct url Direct URL references (PEP 440, PEP 508, PEP 610) C: editable Editable installations C: freeze 'pip freeze' related type: bug A confirmed bug or unintended behavior labels Oct 14, 2020
@pradyunsg
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@sbidoul I'd say we should this make a debug log, starting with "#" to make it a comment, in case someone puts it in a file directly.

@sbidoul
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sbidoul commented Oct 25, 2020

@tombaker I made a fix in #9050. It would great if you give it a spin.

@tombaker
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@sbidoul Starting with a clean install and upgrading to Pip 20.2.4, I still get AssertionError:

535 [] /tmp> git clone https://github.com/tombaker/mklists
Cloning into 'mklists'...
536 [] /tmp> cd mklists
537 [master] /tmp/mklists> python3 -m venv .venv
538 [master] /tmp/mklists> source .venv/bin/activate
(.venv) 539 [master] /tmp/mklists> python3 -m pip install --upgrade pip
Collecting pip ...
Successfully installed pip-20.2.4
(.venv) 540 [master] /tmp/mklists> python3 -m pip install --upgrade flit
Collecting flit ...
(.venv) 541 [master] /tmp/mklists> flit install -s
Installing requirements  ...                                                                                                                                            I-
Writing script to /private/tmp/mklists/.venv/bin/mklists ...
(.venv) 542 [master] /tmp/mklists> python3 -m pip freeze
ERROR: Exception:
Traceback (most recent call last):
  File "/private/tmp/mklists/.venv/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 228, in _main
    status = self.run(options, args)
  File "/private/tmp/mklists/.venv/lib/python3.8/site-packages/pip/_internal/commands/freeze.py", line 101, in run
    for line in freeze(**freeze_kwargs):
  File "/private/tmp/mklists/.venv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 67, in freeze
    req = FrozenRequirement.from_dist(dist)
  File "/private/tmp/mklists/.venv/lib/python3.8/site-packages/pip/_internal/operations/freeze.py", line 257, in from_dist
    req = direct_url_as_pep440_direct_reference(
  File "/private/tmp/mklists/.venv/lib/python3.8/site-packages/pip/_internal/utils/direct_url_helpers.py", line 49, in direct_url_as_pep440_direct_reference
    assert not direct_url.info.editable
AssertionError

@sbidoul
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sbidoul commented Oct 27, 2020

@tombaker sorry I this fix is not released yet. I meant to test the PR. To do so you can install it with "python -m pip install git+https://github.com/pypa/pip@refs/pull/9050/head"

@tombaker
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tombaker commented Oct 27, 2020 via email

@tombaker
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@sbidoul Since I originally raised this on Stackoverflow, what would be the proper etiquette for closing that thread -- with a "comment" to the original post or with an "answer"? Should I simply say that this has been resolved and will appear in the next version of Pip, then reference this GH issue? Any advice appreciated...

@uranusjr
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@tombaker I’m far from an SO expert, but I believe in this case it is fine for you to answer your own question, linking to this thread and the merged PR with relevent description (this is a bug, the fix as been merged, and will be a part of 20.3), and accept that as correct.

@tombaker
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@uranusjr Thank you! I have posted as you suggested.

bors bot referenced this issue in duckinator/emanate Dec 1, 2020
195: Update pip to 20.3 r=duckinator a=pyup-bot


This PR updates [pip](https://pypi.org/project/pip) from **20.2.4** to **20.3**.



<details>
  <summary>Changelog</summary>
  
  
   ### 20.3
   ```
   - Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`8546 &lt;https://github.com/pypa/pip/issues/8546&gt;`_, `8377 &lt;https://github.com/pypa/pip/issues/8377&gt;`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`6741 &lt;https://github.com/pypa/pip/issues/6741&gt;`_)
- Warn if index pages have unexpected content-type (`6754 &lt;https://github.com/pypa/pip/issues/6754&gt;`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`7693 &lt;https://github.com/pypa/pip/issues/7693&gt;`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
  by pip. (`7811 &lt;https://github.com/pypa/pip/issues/7811&gt;`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`8128 &lt;https://github.com/pypa/pip/issues/8128&gt;`_)
- Parallelize network operations in ``pip list``. (`8504 &lt;https://github.com/pypa/pip/issues/8504&gt;`_)
- Allow the new resolver to obtain dependency information through wheels
  lazily downloaded using HTTP range requests.  To enable this feature,
  invoke ``pip`` with ``--use-feature=fast-deps``. (`8588 &lt;https://github.com/pypa/pip/issues/8588&gt;`_)
- Support ``--use-feature`` in requirements files (`8601 &lt;https://github.com/pypa/pip/issues/8601&gt;`_)

Bug Fixes
---------

- Use canonical package names while looking up already installed packages. (`5021 &lt;https://github.com/pypa/pip/issues/5021&gt;`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`7625 &lt;https://github.com/pypa/pip/issues/7625&gt;`_)
- The VCS commands run by pip as subprocesses don&#39;t merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`7968 &lt;https://github.com/pypa/pip/issues/7968&gt;`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
  installed on Windows. (`8342 &lt;https://github.com/pypa/pip/issues/8342&gt;`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`8454 &lt;https://github.com/pypa/pip/issues/8454&gt;`_)
- Headers provided by wheels in .data directories are now correctly installed
  into the user-provided locations, such as ``--prefix``, instead of the virtual
  environment pip is running in. (`8521 &lt;https://github.com/pypa/pip/issues/8521&gt;`_)

Vendored Libraries
------------------

- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9

Improved Documentation
----------------------

- Add ``--no-input`` option to pip docs (`7688 &lt;https://github.com/pypa/pip/issues/7688&gt;`_)
- List of options supported in requirements file are extracted from source of truth,
  instead of being maintained manually. (`7908 &lt;https://github.com/pypa/pip/issues/7908&gt;`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`8072 &lt;https://github.com/pypa/pip/issues/8072&gt;`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`8353 &lt;https://github.com/pypa/pip/issues/8353&gt;`_)
- Fix example for defining multiple values for options which support them (`8373 &lt;https://github.com/pypa/pip/issues/8373&gt;`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`8459 &lt;https://github.com/pypa/pip/issues/8459&gt;`_)
- Add feature flags to docs (`8512 &lt;https://github.com/pypa/pip/issues/8512&gt;`_)
- Document how to install package extras from git branch and source distributions. (`8576 &lt;https://github.com/pypa/pip/issues/8576&gt;`_)
   ```
   
  
  
   ### 20.3b1
   ```
   ===================

Deprecations and Removals
-------------------------

- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
  To keep the previous behavior, users should use the new ``--exclude`` option. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Deprecate support for Python 3.5 (`8181 &lt;https://github.com/pypa/pip/issues/8181&gt;`_)
- Document that certain removals can be fast tracked. (`8417 &lt;https://github.com/pypa/pip/issues/8417&gt;`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 &lt;https://github.com/pypa/pip/issues/8927&gt;`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`9069 &lt;https://github.com/pypa/pip/issues/9069&gt;`_)

Features
--------

- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Allow multiple values for --abi and --platform. (`6121 &lt;https://github.com/pypa/pip/issues/6121&gt;`_)
- Add option ``--format`` to subcommand ``list`` of ``pip  cache``, with ``abspath`` choice to output the full path of a wheel file. (`8355 &lt;https://github.com/pypa/pip/issues/8355&gt;`_)
- Improve error message friendliness when an environment has packages with
  corrupted metadata. (`8676 &lt;https://github.com/pypa/pip/issues/8676&gt;`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
  when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
  situations where both fails are most probably irrelevant to this deprecation. (`8752 &lt;https://github.com/pypa/pip/issues/8752&gt;`_)
- Check the download directory for existing wheels to possibly avoid
  fetching metadata when the ``fast-deps`` feature is used with
  ``pip wheel`` and ``pip download``. (`8804 &lt;https://github.com/pypa/pip/issues/8804&gt;`_)
- When installing a git URL that refers to a commit that is not available locally
  after git clone, attempt to fetch it from the remote. (`8815 &lt;https://github.com/pypa/pip/issues/8815&gt;`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`8892 &lt;https://github.com/pypa/pip/issues/8892&gt;`_)
- Cache package listings on index packages so they are guarenteed to stay stable
  during a pip command session. This also improves performance when a index page
  is accessed multiple times during the command session. (`8905 &lt;https://github.com/pypa/pip/issues/8905&gt;`_)
- New resolver: Tweak resolution logic to improve user experience when
  user-supplied requirements conflict. (`8924 &lt;https://github.com/pypa/pip/issues/8924&gt;`_)
- Support Python 3.9. (`8971 &lt;https://github.com/pypa/pip/issues/8971&gt;`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`8975 &lt;https://github.com/pypa/pip/issues/8975&gt;`_)
- Switch to the new dependency resolver by default. (`9019 &lt;https://github.com/pypa/pip/issues/9019&gt;`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`9049 &lt;https://github.com/pypa/pip/issues/9049&gt;`_)

Bug Fixes
---------

- Propagate ``--extra-index-url`` from requirements file properly to session auth,
  so that keyring auth will work as expected. (`8103 &lt;https://github.com/pypa/pip/issues/8103&gt;`_)
- Allow specifying verbosity and quiet level via configuration files
  and environment variables. Previously these options were treated as
  boolean values when read from there while through CLI the level can be
  specified. (`8578 &lt;https://github.com/pypa/pip/issues/8578&gt;`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
  POSIX environment does not configure the file system encoding correctly. (`8658 &lt;https://github.com/pypa/pip/issues/8658&gt;`_)
- List downloaded distributions before exiting ``pip download``
  when using the new resolver to make the behavior the same as
  that on the legacy resolver. (`8696 &lt;https://github.com/pypa/pip/issues/8696&gt;`_)
- New resolver: Pick up hash declarations in constraints files and use them to
  filter available distributions. (`8792 &lt;https://github.com/pypa/pip/issues/8792&gt;`_)
- Avoid polluting the destination directory by resolution artifacts
  when the new resolver is used for ``pip download`` or ``pip wheel``. (`8827 &lt;https://github.com/pypa/pip/issues/8827&gt;`_)
- New resolver: If a package appears multiple times in user specification with
  different ``--hash`` options, only hashes that present in all specifications
  should be allowed. (`8839 &lt;https://github.com/pypa/pip/issues/8839&gt;`_)
- Tweak the output during dependency resolution in the new resolver. (`8861 &lt;https://github.com/pypa/pip/issues/8861&gt;`_)
- Correctly search for installed distributions in new resolver logic in order
  to not miss packages (virtualenv packages from system-wide-packages for example) (`8963 &lt;https://github.com/pypa/pip/issues/8963&gt;`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
  with editable=True. Render it as a non-editable ``file://`` URL until modern
  editable installs are standardized and supported. (`8996 &lt;https://github.com/pypa/pip/issues/8996&gt;`_)

Vendored Libraries
------------------

- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
  It is mandatory for ``pip debug`` command.

Improved Documentation
----------------------

- Add documentation for &#39;.netrc&#39; support. (`7231 &lt;https://github.com/pypa/pip/issues/7231&gt;`_)
- Add OS tabs for OS-specific commands. (`7311 &lt;https://github.com/pypa/pip/issues/7311&gt;`_)
- Add note and example on keyring support for index basic-auth (`8636 &lt;https://github.com/pypa/pip/issues/8636&gt;`_)
- Added initial UX feedback widgets to docs. (`8783 &lt;https://github.com/pypa/pip/issues/8783&gt;`_, `8848 &lt;https://github.com/pypa/pip/issues/8848&gt;`_)
- Add ux documentation (`8807 &lt;https://github.com/pypa/pip/issues/8807&gt;`_)
- Update user docs to reflect new resolver as default in 20.3. (`9044 &lt;https://github.com/pypa/pip/issues/9044&gt;`_)
- Improve migration guide to reflect changes in new resolver behavior. (`9056 &lt;https://github.com/pypa/pip/issues/9056&gt;`_)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pip
  - Changelog: https://pyup.io/changelogs/pip/
  - Homepage: https://pip.pypa.io/
</details>



Co-authored-by: pyup-bot <[email protected]>
bors bot referenced this issue in duckinator/emanate Dec 1, 2020
195: Update pip to 20.3 r=duckinator a=pyup-bot


This PR updates [pip](https://pypi.org/project/pip) from **20.2.4** to **20.3**.



<details>
  <summary>Changelog</summary>
  
  
   ### 20.3
   ```
   - Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`8546 &lt;https://github.com/pypa/pip/issues/8546&gt;`_, `8377 &lt;https://github.com/pypa/pip/issues/8377&gt;`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`6741 &lt;https://github.com/pypa/pip/issues/6741&gt;`_)
- Warn if index pages have unexpected content-type (`6754 &lt;https://github.com/pypa/pip/issues/6754&gt;`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`7693 &lt;https://github.com/pypa/pip/issues/7693&gt;`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
  by pip. (`7811 &lt;https://github.com/pypa/pip/issues/7811&gt;`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`8128 &lt;https://github.com/pypa/pip/issues/8128&gt;`_)
- Parallelize network operations in ``pip list``. (`8504 &lt;https://github.com/pypa/pip/issues/8504&gt;`_)
- Allow the new resolver to obtain dependency information through wheels
  lazily downloaded using HTTP range requests.  To enable this feature,
  invoke ``pip`` with ``--use-feature=fast-deps``. (`8588 &lt;https://github.com/pypa/pip/issues/8588&gt;`_)
- Support ``--use-feature`` in requirements files (`8601 &lt;https://github.com/pypa/pip/issues/8601&gt;`_)

Bug Fixes
---------

- Use canonical package names while looking up already installed packages. (`5021 &lt;https://github.com/pypa/pip/issues/5021&gt;`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`7625 &lt;https://github.com/pypa/pip/issues/7625&gt;`_)
- The VCS commands run by pip as subprocesses don&#39;t merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`7968 &lt;https://github.com/pypa/pip/issues/7968&gt;`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
  installed on Windows. (`8342 &lt;https://github.com/pypa/pip/issues/8342&gt;`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`8454 &lt;https://github.com/pypa/pip/issues/8454&gt;`_)
- Headers provided by wheels in .data directories are now correctly installed
  into the user-provided locations, such as ``--prefix``, instead of the virtual
  environment pip is running in. (`8521 &lt;https://github.com/pypa/pip/issues/8521&gt;`_)

Vendored Libraries
------------------

- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9

Improved Documentation
----------------------

- Add ``--no-input`` option to pip docs (`7688 &lt;https://github.com/pypa/pip/issues/7688&gt;`_)
- List of options supported in requirements file are extracted from source of truth,
  instead of being maintained manually. (`7908 &lt;https://github.com/pypa/pip/issues/7908&gt;`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`8072 &lt;https://github.com/pypa/pip/issues/8072&gt;`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`8353 &lt;https://github.com/pypa/pip/issues/8353&gt;`_)
- Fix example for defining multiple values for options which support them (`8373 &lt;https://github.com/pypa/pip/issues/8373&gt;`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`8459 &lt;https://github.com/pypa/pip/issues/8459&gt;`_)
- Add feature flags to docs (`8512 &lt;https://github.com/pypa/pip/issues/8512&gt;`_)
- Document how to install package extras from git branch and source distributions. (`8576 &lt;https://github.com/pypa/pip/issues/8576&gt;`_)
   ```
   
  
  
   ### 20.3b1
   ```
   ===================

Deprecations and Removals
-------------------------

- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
  To keep the previous behavior, users should use the new ``--exclude`` option. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Deprecate support for Python 3.5 (`8181 &lt;https://github.com/pypa/pip/issues/8181&gt;`_)
- Document that certain removals can be fast tracked. (`8417 &lt;https://github.com/pypa/pip/issues/8417&gt;`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 &lt;https://github.com/pypa/pip/issues/8927&gt;`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`9069 &lt;https://github.com/pypa/pip/issues/9069&gt;`_)

Features
--------

- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Allow multiple values for --abi and --platform. (`6121 &lt;https://github.com/pypa/pip/issues/6121&gt;`_)
- Add option ``--format`` to subcommand ``list`` of ``pip  cache``, with ``abspath`` choice to output the full path of a wheel file. (`8355 &lt;https://github.com/pypa/pip/issues/8355&gt;`_)
- Improve error message friendliness when an environment has packages with
  corrupted metadata. (`8676 &lt;https://github.com/pypa/pip/issues/8676&gt;`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
  when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
  situations where both fails are most probably irrelevant to this deprecation. (`8752 &lt;https://github.com/pypa/pip/issues/8752&gt;`_)
- Check the download directory for existing wheels to possibly avoid
  fetching metadata when the ``fast-deps`` feature is used with
  ``pip wheel`` and ``pip download``. (`8804 &lt;https://github.com/pypa/pip/issues/8804&gt;`_)
- When installing a git URL that refers to a commit that is not available locally
  after git clone, attempt to fetch it from the remote. (`8815 &lt;https://github.com/pypa/pip/issues/8815&gt;`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`8892 &lt;https://github.com/pypa/pip/issues/8892&gt;`_)
- Cache package listings on index packages so they are guarenteed to stay stable
  during a pip command session. This also improves performance when a index page
  is accessed multiple times during the command session. (`8905 &lt;https://github.com/pypa/pip/issues/8905&gt;`_)
- New resolver: Tweak resolution logic to improve user experience when
  user-supplied requirements conflict. (`8924 &lt;https://github.com/pypa/pip/issues/8924&gt;`_)
- Support Python 3.9. (`8971 &lt;https://github.com/pypa/pip/issues/8971&gt;`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`8975 &lt;https://github.com/pypa/pip/issues/8975&gt;`_)
- Switch to the new dependency resolver by default. (`9019 &lt;https://github.com/pypa/pip/issues/9019&gt;`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`9049 &lt;https://github.com/pypa/pip/issues/9049&gt;`_)

Bug Fixes
---------

- Propagate ``--extra-index-url`` from requirements file properly to session auth,
  so that keyring auth will work as expected. (`8103 &lt;https://github.com/pypa/pip/issues/8103&gt;`_)
- Allow specifying verbosity and quiet level via configuration files
  and environment variables. Previously these options were treated as
  boolean values when read from there while through CLI the level can be
  specified. (`8578 &lt;https://github.com/pypa/pip/issues/8578&gt;`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
  POSIX environment does not configure the file system encoding correctly. (`8658 &lt;https://github.com/pypa/pip/issues/8658&gt;`_)
- List downloaded distributions before exiting ``pip download``
  when using the new resolver to make the behavior the same as
  that on the legacy resolver. (`8696 &lt;https://github.com/pypa/pip/issues/8696&gt;`_)
- New resolver: Pick up hash declarations in constraints files and use them to
  filter available distributions. (`8792 &lt;https://github.com/pypa/pip/issues/8792&gt;`_)
- Avoid polluting the destination directory by resolution artifacts
  when the new resolver is used for ``pip download`` or ``pip wheel``. (`8827 &lt;https://github.com/pypa/pip/issues/8827&gt;`_)
- New resolver: If a package appears multiple times in user specification with
  different ``--hash`` options, only hashes that present in all specifications
  should be allowed. (`8839 &lt;https://github.com/pypa/pip/issues/8839&gt;`_)
- Tweak the output during dependency resolution in the new resolver. (`8861 &lt;https://github.com/pypa/pip/issues/8861&gt;`_)
- Correctly search for installed distributions in new resolver logic in order
  to not miss packages (virtualenv packages from system-wide-packages for example) (`8963 &lt;https://github.com/pypa/pip/issues/8963&gt;`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
  with editable=True. Render it as a non-editable ``file://`` URL until modern
  editable installs are standardized and supported. (`8996 &lt;https://github.com/pypa/pip/issues/8996&gt;`_)

Vendored Libraries
------------------

- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
  It is mandatory for ``pip debug`` command.

Improved Documentation
----------------------

- Add documentation for &#39;.netrc&#39; support. (`7231 &lt;https://github.com/pypa/pip/issues/7231&gt;`_)
- Add OS tabs for OS-specific commands. (`7311 &lt;https://github.com/pypa/pip/issues/7311&gt;`_)
- Add note and example on keyring support for index basic-auth (`8636 &lt;https://github.com/pypa/pip/issues/8636&gt;`_)
- Added initial UX feedback widgets to docs. (`8783 &lt;https://github.com/pypa/pip/issues/8783&gt;`_, `8848 &lt;https://github.com/pypa/pip/issues/8848&gt;`_)
- Add ux documentation (`8807 &lt;https://github.com/pypa/pip/issues/8807&gt;`_)
- Update user docs to reflect new resolver as default in 20.3. (`9044 &lt;https://github.com/pypa/pip/issues/9044&gt;`_)
- Improve migration guide to reflect changes in new resolver behavior. (`9056 &lt;https://github.com/pypa/pip/issues/9056&gt;`_)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pip
  - Changelog: https://pyup.io/changelogs/pip/
  - Homepage: https://pip.pypa.io/
</details>



Co-authored-by: pyup-bot <[email protected]>
bors bot referenced this issue in duckinator/emanate Dec 1, 2020
195: Update pip to 20.3 r=duckinator a=pyup-bot


This PR updates [pip](https://pypi.org/project/pip) from **20.2.4** to **20.3**.



<details>
  <summary>Changelog</summary>
  
  
   ### 20.3
   ```
   - Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`8546 &lt;https://github.com/pypa/pip/issues/8546&gt;`_, `8377 &lt;https://github.com/pypa/pip/issues/8377&gt;`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`6741 &lt;https://github.com/pypa/pip/issues/6741&gt;`_)
- Warn if index pages have unexpected content-type (`6754 &lt;https://github.com/pypa/pip/issues/6754&gt;`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`7693 &lt;https://github.com/pypa/pip/issues/7693&gt;`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
  by pip. (`7811 &lt;https://github.com/pypa/pip/issues/7811&gt;`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`8128 &lt;https://github.com/pypa/pip/issues/8128&gt;`_)
- Parallelize network operations in ``pip list``. (`8504 &lt;https://github.com/pypa/pip/issues/8504&gt;`_)
- Allow the new resolver to obtain dependency information through wheels
  lazily downloaded using HTTP range requests.  To enable this feature,
  invoke ``pip`` with ``--use-feature=fast-deps``. (`8588 &lt;https://github.com/pypa/pip/issues/8588&gt;`_)
- Support ``--use-feature`` in requirements files (`8601 &lt;https://github.com/pypa/pip/issues/8601&gt;`_)

Bug Fixes
---------

- Use canonical package names while looking up already installed packages. (`5021 &lt;https://github.com/pypa/pip/issues/5021&gt;`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`7625 &lt;https://github.com/pypa/pip/issues/7625&gt;`_)
- The VCS commands run by pip as subprocesses don&#39;t merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`7968 &lt;https://github.com/pypa/pip/issues/7968&gt;`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
  installed on Windows. (`8342 &lt;https://github.com/pypa/pip/issues/8342&gt;`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`8454 &lt;https://github.com/pypa/pip/issues/8454&gt;`_)
- Headers provided by wheels in .data directories are now correctly installed
  into the user-provided locations, such as ``--prefix``, instead of the virtual
  environment pip is running in. (`8521 &lt;https://github.com/pypa/pip/issues/8521&gt;`_)

Vendored Libraries
------------------

- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9

Improved Documentation
----------------------

- Add ``--no-input`` option to pip docs (`7688 &lt;https://github.com/pypa/pip/issues/7688&gt;`_)
- List of options supported in requirements file are extracted from source of truth,
  instead of being maintained manually. (`7908 &lt;https://github.com/pypa/pip/issues/7908&gt;`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`8072 &lt;https://github.com/pypa/pip/issues/8072&gt;`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`8353 &lt;https://github.com/pypa/pip/issues/8353&gt;`_)
- Fix example for defining multiple values for options which support them (`8373 &lt;https://github.com/pypa/pip/issues/8373&gt;`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`8459 &lt;https://github.com/pypa/pip/issues/8459&gt;`_)
- Add feature flags to docs (`8512 &lt;https://github.com/pypa/pip/issues/8512&gt;`_)
- Document how to install package extras from git branch and source distributions. (`8576 &lt;https://github.com/pypa/pip/issues/8576&gt;`_)
   ```
   
  
  
   ### 20.3b1
   ```
   ===================

Deprecations and Removals
-------------------------

- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
  To keep the previous behavior, users should use the new ``--exclude`` option. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Deprecate support for Python 3.5 (`8181 &lt;https://github.com/pypa/pip/issues/8181&gt;`_)
- Document that certain removals can be fast tracked. (`8417 &lt;https://github.com/pypa/pip/issues/8417&gt;`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 &lt;https://github.com/pypa/pip/issues/8927&gt;`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`9069 &lt;https://github.com/pypa/pip/issues/9069&gt;`_)

Features
--------

- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Allow multiple values for --abi and --platform. (`6121 &lt;https://github.com/pypa/pip/issues/6121&gt;`_)
- Add option ``--format`` to subcommand ``list`` of ``pip  cache``, with ``abspath`` choice to output the full path of a wheel file. (`8355 &lt;https://github.com/pypa/pip/issues/8355&gt;`_)
- Improve error message friendliness when an environment has packages with
  corrupted metadata. (`8676 &lt;https://github.com/pypa/pip/issues/8676&gt;`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
  when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
  situations where both fails are most probably irrelevant to this deprecation. (`8752 &lt;https://github.com/pypa/pip/issues/8752&gt;`_)
- Check the download directory for existing wheels to possibly avoid
  fetching metadata when the ``fast-deps`` feature is used with
  ``pip wheel`` and ``pip download``. (`8804 &lt;https://github.com/pypa/pip/issues/8804&gt;`_)
- When installing a git URL that refers to a commit that is not available locally
  after git clone, attempt to fetch it from the remote. (`8815 &lt;https://github.com/pypa/pip/issues/8815&gt;`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`8892 &lt;https://github.com/pypa/pip/issues/8892&gt;`_)
- Cache package listings on index packages so they are guarenteed to stay stable
  during a pip command session. This also improves performance when a index page
  is accessed multiple times during the command session. (`8905 &lt;https://github.com/pypa/pip/issues/8905&gt;`_)
- New resolver: Tweak resolution logic to improve user experience when
  user-supplied requirements conflict. (`8924 &lt;https://github.com/pypa/pip/issues/8924&gt;`_)
- Support Python 3.9. (`8971 &lt;https://github.com/pypa/pip/issues/8971&gt;`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`8975 &lt;https://github.com/pypa/pip/issues/8975&gt;`_)
- Switch to the new dependency resolver by default. (`9019 &lt;https://github.com/pypa/pip/issues/9019&gt;`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`9049 &lt;https://github.com/pypa/pip/issues/9049&gt;`_)

Bug Fixes
---------

- Propagate ``--extra-index-url`` from requirements file properly to session auth,
  so that keyring auth will work as expected. (`8103 &lt;https://github.com/pypa/pip/issues/8103&gt;`_)
- Allow specifying verbosity and quiet level via configuration files
  and environment variables. Previously these options were treated as
  boolean values when read from there while through CLI the level can be
  specified. (`8578 &lt;https://github.com/pypa/pip/issues/8578&gt;`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
  POSIX environment does not configure the file system encoding correctly. (`8658 &lt;https://github.com/pypa/pip/issues/8658&gt;`_)
- List downloaded distributions before exiting ``pip download``
  when using the new resolver to make the behavior the same as
  that on the legacy resolver. (`8696 &lt;https://github.com/pypa/pip/issues/8696&gt;`_)
- New resolver: Pick up hash declarations in constraints files and use them to
  filter available distributions. (`8792 &lt;https://github.com/pypa/pip/issues/8792&gt;`_)
- Avoid polluting the destination directory by resolution artifacts
  when the new resolver is used for ``pip download`` or ``pip wheel``. (`8827 &lt;https://github.com/pypa/pip/issues/8827&gt;`_)
- New resolver: If a package appears multiple times in user specification with
  different ``--hash`` options, only hashes that present in all specifications
  should be allowed. (`8839 &lt;https://github.com/pypa/pip/issues/8839&gt;`_)
- Tweak the output during dependency resolution in the new resolver. (`8861 &lt;https://github.com/pypa/pip/issues/8861&gt;`_)
- Correctly search for installed distributions in new resolver logic in order
  to not miss packages (virtualenv packages from system-wide-packages for example) (`8963 &lt;https://github.com/pypa/pip/issues/8963&gt;`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
  with editable=True. Render it as a non-editable ``file://`` URL until modern
  editable installs are standardized and supported. (`8996 &lt;https://github.com/pypa/pip/issues/8996&gt;`_)

Vendored Libraries
------------------

- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
  It is mandatory for ``pip debug`` command.

Improved Documentation
----------------------

- Add documentation for &#39;.netrc&#39; support. (`7231 &lt;https://github.com/pypa/pip/issues/7231&gt;`_)
- Add OS tabs for OS-specific commands. (`7311 &lt;https://github.com/pypa/pip/issues/7311&gt;`_)
- Add note and example on keyring support for index basic-auth (`8636 &lt;https://github.com/pypa/pip/issues/8636&gt;`_)
- Added initial UX feedback widgets to docs. (`8783 &lt;https://github.com/pypa/pip/issues/8783&gt;`_, `8848 &lt;https://github.com/pypa/pip/issues/8848&gt;`_)
- Add ux documentation (`8807 &lt;https://github.com/pypa/pip/issues/8807&gt;`_)
- Update user docs to reflect new resolver as default in 20.3. (`9044 &lt;https://github.com/pypa/pip/issues/9044&gt;`_)
- Improve migration guide to reflect changes in new resolver behavior. (`9056 &lt;https://github.com/pypa/pip/issues/9056&gt;`_)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pip
  - Changelog: https://pyup.io/changelogs/pip/
  - Homepage: https://pip.pypa.io/
</details>



Co-authored-by: pyup-bot <[email protected]>
bors bot referenced this issue in duckinator/emanate Dec 4, 2020
194: Update pytest-pylint to 0.18.0 r=duckinator a=pyup-bot


This PR updates [pytest-pylint](https://pypi.org/project/pytest-pylint) from **0.17.0** to **0.18.0**.



*The bot wasn't able to find a changelog for this release. [Got an idea?](https://github.com/pyupio/changelogs/issues/new)*

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pytest-pylint
  - Changelog: https://pyup.io/changelogs/pytest-pylint/
  - Repo: https://github.com/carsongee/pytest-pylint
</details>



197: Update pip to 20.3.1 r=duckinator a=pyup-bot


This PR updates [pip](https://pypi.org/project/pip) from **20.2.4** to **20.3.1**.



<details>
  <summary>Changelog</summary>
  
  
   ### 20.3.1
   ```
   ===================

Deprecations and Removals
-------------------------

- The --build-dir option has been restored as a no-op, to soften the transition
  for tools that still used it. (`9193 &lt;https://github.com/pypa/pip/issues/9193&gt;`_)
   ```
   
  
  
   ### 20.3
   ```
   - Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`8546 &lt;https://github.com/pypa/pip/issues/8546&gt;`_, `8377 &lt;https://github.com/pypa/pip/issues/8377&gt;`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`6741 &lt;https://github.com/pypa/pip/issues/6741&gt;`_)
- Warn if index pages have unexpected content-type (`6754 &lt;https://github.com/pypa/pip/issues/6754&gt;`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`7693 &lt;https://github.com/pypa/pip/issues/7693&gt;`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
  by pip. (`7811 &lt;https://github.com/pypa/pip/issues/7811&gt;`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`8128 &lt;https://github.com/pypa/pip/issues/8128&gt;`_)
- Parallelize network operations in ``pip list``. (`8504 &lt;https://github.com/pypa/pip/issues/8504&gt;`_)
- Allow the new resolver to obtain dependency information through wheels
  lazily downloaded using HTTP range requests.  To enable this feature,
  invoke ``pip`` with ``--use-feature=fast-deps``. (`8588 &lt;https://github.com/pypa/pip/issues/8588&gt;`_)
- Support ``--use-feature`` in requirements files (`8601 &lt;https://github.com/pypa/pip/issues/8601&gt;`_)

Bug Fixes
---------

- Use canonical package names while looking up already installed packages. (`5021 &lt;https://github.com/pypa/pip/issues/5021&gt;`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`7625 &lt;https://github.com/pypa/pip/issues/7625&gt;`_)
- The VCS commands run by pip as subprocesses don&#39;t merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`7968 &lt;https://github.com/pypa/pip/issues/7968&gt;`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
  installed on Windows. (`8342 &lt;https://github.com/pypa/pip/issues/8342&gt;`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`8454 &lt;https://github.com/pypa/pip/issues/8454&gt;`_)
- Headers provided by wheels in .data directories are now correctly installed
  into the user-provided locations, such as ``--prefix``, instead of the virtual
  environment pip is running in. (`8521 &lt;https://github.com/pypa/pip/issues/8521&gt;`_)

Vendored Libraries
------------------

- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9

Improved Documentation
----------------------

- Add ``--no-input`` option to pip docs (`7688 &lt;https://github.com/pypa/pip/issues/7688&gt;`_)
- List of options supported in requirements file are extracted from source of truth,
  instead of being maintained manually. (`7908 &lt;https://github.com/pypa/pip/issues/7908&gt;`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`8072 &lt;https://github.com/pypa/pip/issues/8072&gt;`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`8353 &lt;https://github.com/pypa/pip/issues/8353&gt;`_)
- Fix example for defining multiple values for options which support them (`8373 &lt;https://github.com/pypa/pip/issues/8373&gt;`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`8459 &lt;https://github.com/pypa/pip/issues/8459&gt;`_)
- Add feature flags to docs (`8512 &lt;https://github.com/pypa/pip/issues/8512&gt;`_)
- Document how to install package extras from git branch and source distributions. (`8576 &lt;https://github.com/pypa/pip/issues/8576&gt;`_)
   ```
   
  
  
   ### 20.3b1
   ```
   ===================

Deprecations and Removals
-------------------------

- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
  To keep the previous behavior, users should use the new ``--exclude`` option. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Deprecate support for Python 3.5 (`8181 &lt;https://github.com/pypa/pip/issues/8181&gt;`_)
- Document that certain removals can be fast tracked. (`8417 &lt;https://github.com/pypa/pip/issues/8417&gt;`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 &lt;https://github.com/pypa/pip/issues/8927&gt;`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`9069 &lt;https://github.com/pypa/pip/issues/9069&gt;`_)

Features
--------

- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`4256 &lt;https://github.com/pypa/pip/issues/4256&gt;`_)
- Allow multiple values for --abi and --platform. (`6121 &lt;https://github.com/pypa/pip/issues/6121&gt;`_)
- Add option ``--format`` to subcommand ``list`` of ``pip  cache``, with ``abspath`` choice to output the full path of a wheel file. (`8355 &lt;https://github.com/pypa/pip/issues/8355&gt;`_)
- Improve error message friendliness when an environment has packages with
  corrupted metadata. (`8676 &lt;https://github.com/pypa/pip/issues/8676&gt;`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
  when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
  situations where both fails are most probably irrelevant to this deprecation. (`8752 &lt;https://github.com/pypa/pip/issues/8752&gt;`_)
- Check the download directory for existing wheels to possibly avoid
  fetching metadata when the ``fast-deps`` feature is used with
  ``pip wheel`` and ``pip download``. (`8804 &lt;https://github.com/pypa/pip/issues/8804&gt;`_)
- When installing a git URL that refers to a commit that is not available locally
  after git clone, attempt to fetch it from the remote. (`8815 &lt;https://github.com/pypa/pip/issues/8815&gt;`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`8892 &lt;https://github.com/pypa/pip/issues/8892&gt;`_)
- Cache package listings on index packages so they are guarenteed to stay stable
  during a pip command session. This also improves performance when a index page
  is accessed multiple times during the command session. (`8905 &lt;https://github.com/pypa/pip/issues/8905&gt;`_)
- New resolver: Tweak resolution logic to improve user experience when
  user-supplied requirements conflict. (`8924 &lt;https://github.com/pypa/pip/issues/8924&gt;`_)
- Support Python 3.9. (`8971 &lt;https://github.com/pypa/pip/issues/8971&gt;`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`8975 &lt;https://github.com/pypa/pip/issues/8975&gt;`_)
- Switch to the new dependency resolver by default. (`9019 &lt;https://github.com/pypa/pip/issues/9019&gt;`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`9049 &lt;https://github.com/pypa/pip/issues/9049&gt;`_)

Bug Fixes
---------

- Propagate ``--extra-index-url`` from requirements file properly to session auth,
  so that keyring auth will work as expected. (`8103 &lt;https://github.com/pypa/pip/issues/8103&gt;`_)
- Allow specifying verbosity and quiet level via configuration files
  and environment variables. Previously these options were treated as
  boolean values when read from there while through CLI the level can be
  specified. (`8578 &lt;https://github.com/pypa/pip/issues/8578&gt;`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
  POSIX environment does not configure the file system encoding correctly. (`8658 &lt;https://github.com/pypa/pip/issues/8658&gt;`_)
- List downloaded distributions before exiting ``pip download``
  when using the new resolver to make the behavior the same as
  that on the legacy resolver. (`8696 &lt;https://github.com/pypa/pip/issues/8696&gt;`_)
- New resolver: Pick up hash declarations in constraints files and use them to
  filter available distributions. (`8792 &lt;https://github.com/pypa/pip/issues/8792&gt;`_)
- Avoid polluting the destination directory by resolution artifacts
  when the new resolver is used for ``pip download`` or ``pip wheel``. (`8827 &lt;https://github.com/pypa/pip/issues/8827&gt;`_)
- New resolver: If a package appears multiple times in user specification with
  different ``--hash`` options, only hashes that present in all specifications
  should be allowed. (`8839 &lt;https://github.com/pypa/pip/issues/8839&gt;`_)
- Tweak the output during dependency resolution in the new resolver. (`8861 &lt;https://github.com/pypa/pip/issues/8861&gt;`_)
- Correctly search for installed distributions in new resolver logic in order
  to not miss packages (virtualenv packages from system-wide-packages for example) (`8963 &lt;https://github.com/pypa/pip/issues/8963&gt;`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
  with editable=True. Render it as a non-editable ``file://`` URL until modern
  editable installs are standardized and supported. (`8996 &lt;https://github.com/pypa/pip/issues/8996&gt;`_)

Vendored Libraries
------------------

- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
  It is mandatory for ``pip debug`` command.

Improved Documentation
----------------------

- Add documentation for &#39;.netrc&#39; support. (`7231 &lt;https://github.com/pypa/pip/issues/7231&gt;`_)
- Add OS tabs for OS-specific commands. (`7311 &lt;https://github.com/pypa/pip/issues/7311&gt;`_)
- Add note and example on keyring support for index basic-auth (`8636 &lt;https://github.com/pypa/pip/issues/8636&gt;`_)
- Added initial UX feedback widgets to docs. (`8783 &lt;https://github.com/pypa/pip/issues/8783&gt;`_, `8848 &lt;https://github.com/pypa/pip/issues/8848&gt;`_)
- Add ux documentation (`8807 &lt;https://github.com/pypa/pip/issues/8807&gt;`_)
- Update user docs to reflect new resolver as default in 20.3. (`9044 &lt;https://github.com/pypa/pip/issues/9044&gt;`_)
- Improve migration guide to reflect changes in new resolver behavior. (`9056 &lt;https://github.com/pypa/pip/issues/9056&gt;`_)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pip
  - Changelog: https://pyup.io/changelogs/pip/
  - Homepage: https://pip.pypa.io/
</details>



Co-authored-by: pyup-bot <[email protected]>
Co-authored-by: Ellen Marie Dash <[email protected]>
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