PYTHONPATH

WINXP

To use more than one versions of Python in the same PC

• From CONTROL PANEL

SYSTEM

ADVANCED

ENVIROMENTAL VARIABLES

PYTHONPATH

• Set to:

C:\PYTHON26;C:\PYTHON26\DLLs;C:\PYTHON26\LIB;C:\PYTHON26\LIB\LIB-TK

• OR TO

C:\PYTHON27;C:\PYTHON27\DLLs;C:\PYTHON27\LIB;C:\PYTHON27\LIB\LIB-TK

• PYTHONPATH variable Supersedes other Python path that is included to PATH variable
• It is best choice to remove all python paths from PATH variable and control which Python version will be used from PYTHONPATH variable only

Alternative Solution

• Use eclipse-classic with pyDev

• Run configurations can control the used python version
• Better control than WIN PYHTONPATH system variable
• Works also in LINUX, MAC

References

• http://docs.python.org/using/windows.html
• http://stackoverflow.com/questions/6698932/how-exactly-is-python2s-sys-path-set-in-windows