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PyMELInstaller is a Python script that installs PyMEL (for use in Maya scripts). If you need PyMEL for a single-file script and don't want the user to have to bother installing PyMEL, this is the way to go.
Simply copy the content of the downloaded file (2 lines) in the top of your script.
Also available at GitHub: https://github.com/EClaesson/PyMELInstaller