pip uninstall cannot create file in default TEMP path

[dogod621]

Environment

• pip version: pip3.6 18.1
• Python version: python 3.6
• OS: WIN10

When I am uninstalling tensorflow-gpu package,
pip report errors and cannot finish the uninstall command.

Exception:
Traceback (most recent call last):
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\shutil.py", line 544, in move
    os.rename(src, real_dst)
FileNotFoundError: [WinError 3] 系統找不到指定的路徑。: 'd:\\program files (x86)\\microsoft visual studio\\shared\\python36_64\\lib\\site-packages\\tensorflow\\include\\tensorflow\\include\\external\\eigen_archive\\eigen\\src\\iterativelinearsolvers\\leastsquareconjugategradient.h' -> 'C:\\Users\\ITRI\\AppData\\Local\\Temp\\pip-uninstall-prs9c6zj\\program files (x86)\\microsoft visual studio\\shared\\python36_64\\lib\\site-packages\\tensorflow\\include\\tensorflow\\include\\external\\eigen_archive\\eigen\\src\\iterativelinearsolvers\\leastsquareconjugategradient.h'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\site-packages\pip\_internal\cli\base_command.py", line 143, in main
    status = self.run(options, args)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\site-packages\pip\_internal\commands\uninstall.py", line 75, in run
    auto_confirm=options.yes, verbose=self.verbosity > 0,
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\site-packages\pip\_internal\req\req_install.py", line 683, in uninstall
    uninstalled_pathset.remove(auto_confirm, verbose)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\site-packages\pip\_internal\req\req_uninstall.py", line 224, in remove
    renames(path, new_path)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\site-packages\pip\_internal\utils\misc.py", line 280, in renames
    shutil.move(old, new)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\shutil.py", line 558, in move
    copy_function(src, real_dst)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\shutil.py", line 257, in copy2
    copyfile(src, dst, follow_symlinks=follow_symlinks)
  File "d:\program files (x86)\microsoft visual studio\shared\python36_64\lib\shutil.py", line 121, in copyfile
    with open(dst, 'wb') as fdst:
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\ITRI\\AppData\\Local\\Temp\\pip-uninstall-prs9c6zj\\program files (x86)\\microsoft visual studio\\shared\\python36_64\\lib\\site-packages\\tensorflow\\include\\tensorflow\\include\\external\\eigen_archive\\eigen\\src\\iterativelinearsolvers\\leastsquareconjugategradient.h'

My default TEMP path is C:\Users\ITRI\AppData\Local\Temp\,
I found it cannot create file in default TEMP path,
so pip cannot copy the files to TEMP Dir ( In my example it cannot copy leastsquareconjugategradient.h in tensorflow install Dir to TEMP Dir),
and cause errors....
(PS 1. No matter how hard I am trying...),
(PS 2. But it can create folders in default TEMP path)
The problem may related to the slash issue in path string, but python automatically changes the string's slash to two inverse slash, so I cannot pass the string with the slash type which is I want, so I cannot try it.

So I change the TEMP path in Python36_64/Lib/site-packages/pip/_internal/utils/temp_dir.py
via adding tempfile.tempdir = 'D:/PythonTemp'

from __future__ import absolute_import

import logging
import os.path
import tempfile

from pip._internal.utils.misc import rmtree

logger = logging.getLogger(__name__)

tempfile.tempdir = 'D:/PythonTemp'

And then everything is fine~

[zooba]

This is almost certainly due to #3055.

[chrahunt]

Yup, the not-found path is length 261, just over the max of 260. Since this looks like a clear duplicate I will close it eagerly, but please let us know if the fix does not work.