Although it isn't necessary to turn your Python programs into executables, many people want to be able to put their Python programs on other machines that don't have Python installed.
Py2exe makes an executable of your Python program. For Windows only. http://sourceforge.net/projects/py2exe
Gordon McMillan's installer (now called pyInstaller) also makes Linux (and Irix!) executables. http://pyinstaller.hpcf.upr.edu/cgi-bin/trac.cgi
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