I've seen Python programs that can be activated from the command line. For example:
hg This displays a list of commands for the Mercurial revision control system. But another command is this: hg commit "This is a commit name" Mercurial is written in Python. I know that commit is a function that commits to a repo, but what command does the program use in order to get the commit name, like "This is a commit name" (This would make a commit with "This is a commit name" as the commit name)
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