New submission from Christian Ullrich:

After installing python-3.4.0.amd64.msi on Windows 8.1 x64, the "pip" command 
(and the versioned ones as well) only work for administrators. Regular users 
get this:

Traceback (most recent call last):
  File "C:\Program Files\Python34\lib\runpy.py", line 171, in 
_run_module_as_main
    "__main__", mod_spec)
  File "C:\Program Files\Python34\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Program Files\Python34\Scripts\pip.exe\__main__.py", line 5, in 
<module>
ImportError: cannot import name 'main'

The immediate reason is that the files in the site-packages/pip directory are 
created with no access permissions for non-administrators:

C:\Program Files\Python34\Lib\site-packages\pip>icacls __main__.py
__main__.py NT-AUTHORITY\SYSTEM:(F)
            BUILTIN\Administrators:(F)
            abc\Admin:(F)

Why that is, I have no idea. It can be fixed by running:

icacls path\to\site-packages\pip /inheritance:e /t
icacls path\to\site-packages\pip /reset /t

The /reset may be unnecessary.

----------
components: Installation, Windows
messages: 214527
nosy: Christian.Ullrich
priority: normal
severity: normal
status: open
title: pip usable only by administrators on Windows
type: behavior
versions: Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21030>
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