Module that contains the command line app.

Why does this file exist, and why not put this in __main__?

You might be tempted to import things from __main__ later, but that will cause problems: the code will get executed twice:

  • When you run python python will execute as a script. That means there won’t be any in sys.modules.
  • When you import __main__ it will get executed again (as a module) because there’s no in sys.modules.

Also see (1) from