I have two versions of python installed on Win7. (Python 2.5 and Python 2.7).
They are located in 'C: / Python25' and 'C: / Python27' respectively.
I am trying to run a file using Python 2.5, but by default Cygwin raises 2.7.
How to change which version of Cygwin is using?
A quick way is to reorder $ PATH so that 2.5 is selected first. The correct way is to use virtualenv to create a jail environment specific to the python version.
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You may have good newbies looking at virtualenv and pip here