Python 3.7 and 3.8 installed from the  Windows Store do not start under git bash. Rather, they give some variation of this error message:

bash: /c/Users/pa/AppData/Local/Microsoft/WindowsApps/python: Permission denied

However, the permissions are rwxr-xr-x, or 755 if you prefer. The same error occurs if I try to run pip.

How can I run python under git bash? I use python and various pip-installed executables (e.g. black) for git hooks, so this has to work for my workflow.

['crash' means something like Windows 'your program has quit running' box.]

Do other Windows Store 'apps' run from bash? (Or from Command Prompt or Power Shell?)

For an immediate solution, install Python normally, as a command-line program, with the python.org Windows installer.

Terry@Tejarex MINGW64 ~
$ python
Python 3.7.5 (tags/v3.7.5:5c02a39a0b, Oct 15 2019, 00:11:34) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()

Terry@Tejarex MINGW64 ~
$ py
Python 3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019, 19:37:50) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()

Terry@Tejarex MINGW64 ~
$ py -m idlelib
[IDLE 3.8 shell runs]

You should then be able to run 'py -x.y pip install ...' to install to python x.y.

Steve, can and will you make store python runnable under bash or should this be closed?

The problem is that Cygwin (on which MinGW and Git Bash are based) tries to read the contents of the executable file, rather than just executing it. The type of link used by Windows here cannot be read as a normal file.

The provided workaround is the best we can offer. Someone who is allowed to handle GPL code without impacting their job (not me) could try removing whatever additional check is being attempted here in Cygwin.