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python(1)                 BSD General Commands Manual                python(1)


     python, pythonw -- an interpreted, interactive, object-oriented program-
     ming language


     python ...
     pythonw ...


     To support multiple versions, the programs named python and pythonw now
     just select the real version of Python to run, depending on various set-
     tings.  (As of Python 2.5, python and pythonw are interchangeable; both
     execute Python in the context of an application bundle, which means they
     have access to the Graphical User Interface; thus both can, when properly
     programmed, display windows, dialogs, etc.)  The current supported ver-
     sions are 2.6 and 2.7, with the default being 2.6.  Use

           % man python2.6
           % man python2.7
           % man pythonw2.6
           % man pythonw2.7

     to see the man page for a specific version.  Without a version specified,

           % man pydoc

     and the like, will show the man page for the (unmodified) default version
     of Python (2.6).  To see the man page for a specific version, use, for

           % man pydoc2.7



           % defaults write Version 2.7

     will make version 2.7 the user default when running the both the python
     and pythonw commands (versioner is the internal name of the version-
     selection software used).

     To set a system-wide default, replace `' with
     `/Library/Preferences/' (admin privileges will
     be required).

     The environment variable VERSIONER_PYTHON_VERSION can also be used to set
     the python and pythonw version:

           % export VERSIONER_PYTHON_VERSION=2.7 # Bourne-like shells
           % setenv VERSIONER_PYTHON_VERSION 2.7 # C-like shells
           % python ...

     This environment variable takes precedence over the preference file set-


     Versions 2.6 and 2.7 support 64-bit execution (which is on by default).

     Like the version of Python, the python command can select between 32 and
     64-bit execution (when both are available).  Use:

           % defaults write Prefer-32-Bit -bool yes

     to make 32-bit execution the user default (using
     `/Library/Preferences/' will set the system-
     wide default).  The environment variable VERSIONER_PYTHON_PREFER_32_BIT
     can also be used (has precedence over the preference file):

           % export VERSIONER_PYTHON_PREFER_32_BIT=yes # Bourne-like shells
           % setenv VERSIONER_PYTHON_PREFER_32_BIT yes # C-like shells

     Again, the preference setting and environmental variable applies to both
     python and pythonw.


     Rather than using the python command, one can use a specific version
     directly.  For example, running python2.7 from the command line will run
     the 2.7 version of Python, independent of what the default version of
     Python is.

     One can use a specific version of Python on the #! line of a script, but
     that may have portability and future compatibility issues.

     Note that the preference files and environment variable that apply to the
     python command, do not apply when running a specific version of Python.
     In particular, running python2.6 will always default to 64-bit execution
     (unless one uses the arch(1) command to specifically select a 32-bit


     python2.6(1), python2.7(1), pythonw2.6(1), pythonw2.7(1), arch(1)

BSD                              Aug 10, 2008                              BSD

Mac OS X 10.7 - Generated Tue Aug 9 20:41:58 CDT 2011
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