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I am running a windows machine have installed Python 2.5. I also used the windows installer to install NumPy.
This all works great when I run the Python (command line) tool that comes with Python.
However, if I run cygwin and then run Python from within, it cannot find the numpy package.
What environment variable do I need to set? What value should it be set to?
Cygwin comes with its own version of Python, so it’s likely that you have two Python installs on your system; one that installed under Windows and one which came with Cygwin.
To test this, try opening a bash prompt in Cygwin and typing
which pythonto see where the Python executable is located. If it says/cygdrive/c/Python25/python.exeor something similar then you’ll know you’re running the Windows executable. If you see/usr/local/bin/pythonor something like that, then you’ll know that you’re running the Cygwin version.I recommend opening a DOS prompt and running Python from there when you need interactive usage. This will keep your two Python installs nicely separate (it can be very useful to have both; I do this on my own machine). Also, you may have some problems running a program designed for Windows interactive console use from within a Cygwin shell.