Case problem running virtualenv on windows 7

[j...@barrockproperties.com]

I just installed virtualenv and am getting an error trying to create an environment.  Based on some print statements I added, sys.prefix seems to be getting lowercased somewhere within virtualenv.exe, before runpy.py starts.  And that leads to an error in change_prefix.

I can't figure out what's going on inside virtualenv.exe, so this was as far as I was able to debug it.  Any advice?

C:\Users\Jim>mkvirtualenv lob

mkvirtualenv.bat about to call virtualenv.exe, sys.prefix = C:\Users\Jim\AppData\Local\Programs\Python\Python36
_run_module_as_main entered, sys.prefix = c:\users\jim\appdata\local\programs\python\python36

Traceback (most recent call last):
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\runpy.py", line 194, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Scripts\virtualenv.exe\__main__.py", line 9, in <module>
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\site-packages\virtualenv.py", line 714, in main
    symlink=options.symlink)
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\site-packages\virtualenv.py", line 926, in create_environment
    site_packages=site_packages, clear=clear, symlink=symlink))
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\site-packages\virtualenv.py", line 1138, in install_python
    copy_required_modules(home_dir, symlink)
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\site-packages\virtualenv.py", line 1068, in copy_required_modules
    dst_filename = change_prefix(filename, dst_prefix)
  File "C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\site-packages\virtualenv.py", line 1042, in change_prefix
    (filename, prefixes)
AssertionError: Filename C:\Users\Jim\AppData\Local\Programs\Python\Python36\Lib\os.py does not start with any of these prefixes: ['C:\\users\\jim\\appdata\\local\\programs\\python\\python36', 'C:\\users\\jim\\appdata\\local\\programs\\python\\python36']

I'm running windows 7 64 bit, python 3.6.1, virtualenv 15.1.0.

[Paul Moore]

On 11 August 2017 at 16:06, <j...@barrockproperties.com> wrote:
> I just installed virtualenv and am getting an error trying to create an
> environment. Based on some print statements I added, sys.prefix seems to be
> getting lowercased somewhere within virtualenv.exe, before runpy.py starts.
> And that leads to an error in change_prefix.
>
> I can't figure out what's going on inside virtualenv.exe, so this was as far
> as I was able to debug it. Any advice?
>
>
> C:\Users\Jim>mkvirtualenv lob
>
> mkvirtualenv.bat about to call virtualenv.exe, sys.prefix =
> C:\Users\Jim\AppData\Local\Programs\Python\Python36
> _run_module_as_main entered, sys.prefix =
> c:\users\jim\appdata\local\programs\python\python36

This isn't something I've encountered, but having said that I don't
use "mkvirtualenv.bat" - which is not something that comes with
virtualenv. Presumably you got it from some other package? It looks
like it might be from a Windows port of virtualenvwrapper. I suspect
the problem is in there, and you'd do better reporting the issue to
the author of that package.

Alternatively, if you can reproduce the problem just using virtualenv
itself ("virtualenv env_name") then post that output.

Paul

[j...@barrockproperties.com]

It's just a batch file that wraps virtualenv.exe.  I get the same output, less the first print statement, when I call virtualenv.exe directly.

[Paul Moore]

Well, all I can say is that it doesn't do this for me:

>virtualenv.exe xxx
Using base prefix
'c:\\users\\gustav\\appdata\\local\\programs\\python\\python36'
New python executable in C:\Work\Scratch\xxx\Scripts\python.exe
Installing setuptools, pip, wheel...done.

Yes, the base prefix is lowercased, as you can see, but it doesn't
cause any issues.

It's difficult to know what might be going on here. I assume it's the
standard Windows build of Python from python.org, and that you're
using a standard NTFS filesystem (you don't have a case sensitive
filesystem for your home directory, do you?)

Sorry I can't offer more help...
Paul

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[j...@barrockproperties.com]

The error isn't coming from the OS, there's case-sensitive logic in virtualenv.pl.

[Paul Moore]

Have you found a specific issue in the code? All I can say is that it
works on other systems (such as mine) so there's *something* about
your system that is triggering the issue, that isn't present on other
systems. We'll need to establish what that difference is to identify
the problem, unless you've already spotted it.

Paul