Python 3.7 installation fails due to PyYAML 3.12

[AngelloMaggio]

• Conan version: 1.6

• Python version: 3.7

• Issue:
  Installation of Conan fails when using Python 3.7 fails due to a bug with PyYAML

• Reproduce:

• Install Python 3.7 including pip3

• pip3 install conan

• Error out
  Command "/usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/tmp/pip-install-7qbn6h01/PyYAML/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/tmp/pip-record-obq_96in/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/tmp/pip-install-7qbn6h01/PyYAML/

• Solution

• Change dependency version to 3.13.

[ArekPiekarz]

The same problem is present on Msys2, where Python 3.7 is now the default version (I don't even know if it can be downgraded). I didn't post an issue about it earlier, because I don't have access to Windows to gather logs.

[zubairkhalid11]

pip install --ignore-installed PyYAML

this worked once you have done that install the library afterwards.

[sankalp7654]

Thanks, @lasote Changing the version of PyYAML from 3.12 to 3.13 helped me!

[theuntoldcreator]

@lasote , Thanks for the issue (Changing of 3.12 to 3.13) helped me a lot😊