Python: get windows OS version and architecture

Question

First of all, I don't think this question is a duplicate of
Detect 64bit OS (windows) in Python
because imho it has not been thoroughly answered.

The only approaching answer is:

Use sys.getwindowsversion() or the existence of PROGRAMFILES(X86) (if 'PROGRAMFILES(X86)' in os.environ)

But:

• Does the windows environment variable PROGRAMFILES(X86) reliable? I fear that anyone can create it, even if it's not present on the system.
• How to use sys.getwindowsversion() in order to get the architecture?

Regarding sys.getwindowsversion():
The link http://docs.python.org/library/sys.html#sys.getwindowsversion
leads us to http://msdn.microsoft.com/en-us/library/ms724451%28VS.85%29.aspx
but I don't see anything related to the architecture (32bit/64bit).
Moreover, the platform element in the returned tuple seems to be independent of the architecture.

One last note: I'm looking for a solution using both python 2.5 and a windows version starting at Windows XP

Thanks!

Edit:
The relevant info is available here
http://msdn.microsoft.com/en-us/library/ms724340%28v=VS.85%29.aspx
but how can I get this with python?

Edit2: On a 64bit windows, with a 32bit python interpreter:

• os.environ["PROCESSOR_ARCHITECTURE"] returns
  • 'x86'
• platform.architecture() returns
  • ('32bit', 'WindowsPE')

Answer 1

I think the platform module is really the best way to get this info.

  >>> import platform
  >>> platform.platform()
  'Windows-7-6.1.7601-SP1'
  platform.processor()
  'Intel64 Family 6 Model 42 Stepping 7, GenuineIntel'

I don't see where to get a firm answer on 32/64 bit windows from here, so I suggest this:

  try:
      os.environ["PROGRAMFILES(X86)"]
      bits = 64
  except:
      bits = 32
  print "Win{0}".format(bits)

or, if you need to know which flavor of Python you are running (as you can run x32 python under x64 Windows):

x32 python x64 windows:
>>> platform.architecture()
('32bit', 'WindowsPE')
>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'

x64 python x64 windows:
>>> platform.architecture()
('64bit', 'WindowsPE')
>>> sys.version
'2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit (AMD64)]'

Answer 2

These variables show your current runtime status on windows:

@rem Test environment using this table:
@rem
@rem Environment Variable       32bit Native    64bit Native    WOW64
@rem PROCESSOR_ARCHITECTURE     x86             AMD64           x86
@rem PROCESSOR_ARCHITEW6432     undefined       undefined       AMD64
@rem