[Bug 46108] New: Wine creates env var with empty string for name and it breaks python-pip

https://bugs.winehq.org/show_bug.cgi?id=46108

Bug ID: 46108
           Summary: Wine creates env var with empty string for name and it
                    breaks python-pip
           Product: Wine
           Version: 3.17
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When I try and install things using pip (from python 2.7, since python 3.5
install doesn't work right not).

it fails, with

*** ValueError: illegal environment variable name

If I open the python interpreter I can see there is an env var with the name of
an empty string:
> > > import os
> > > os.environ['']

'Z:=Z:\home\stu\Downloads'

I had a look at this outside of wine and the env var doesn't show up when
running the same python.

I edited pythons pip code to remove the env var:
~/.wine/drive_c/Python27/Lib/site-packages/pip/_internal/utils/misc.py

I changed these lines:

env = os.environ.copy()
    if extra_environ:
        env.update(extra_environ)

To:

env = os.environ.copy()
    if extra_environ:
        env.update(extra_environ)
    env.pop('')

And then pip succeeds