[pypy-issue] Issue #3155: pypy3 on Windows uses non Windows install path (pypy/pypy)

[Bernat Gabor]

New issue 3155: pypy3 on Windows uses non Windows install path
https://bitbucket.org/pypy/pypy/issues/3155/pypy3-on-windows-uses-non-windows-install

Bernat Gabor:

The destination folder to install pip packages is delegated by pip to distutils, more specifically to distutils install command \([https://github.com/pypa/pip/blob/master/src/pip/\_internal/locations.py#L95-L129](https://github.com/pypa/pip/blob/master/src/pip/_internal/locations.py#L95-L129)\). The distutils install command performs a lookup to determine the schemes to use, this happens here \([https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/distutils/command/install.py#lines-464:466](https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/distutils/command/install.py#lines-464:466)\) and is unconditionally set to pypy. The pypy schema is defined under [https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/distutils/command/install.py#lines-46:52](https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/distutils/command/install.py#lines-46:52). The problem is the following line:  
  
`       'scripts': '$base/bin',`

On all platforms the script folder is bin.  The venv module though sets the script folder to Scripts, here \([https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/venv/\_\_init\_\_.py#lines-131](https://bitbucket.org/pypy/pypy/src/release-pypy3.6-v7.3.0/lib-python/3/venv/__init__.py#lines-131)\). The combination of these two causes pypy3 virtual environments to have their python executables on Windows using the Script folder, while pip installing all-new executable to the bin folder. Is this duality intended?