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Hashbang is a Python 3 library for quickly creating command-line ready scripts. In the most basic form, a simple hashbang command can be just a simple annotation. For more complex types, it relies on Python3's keyword-only arguments to provide a seamless syntax for command line usage.

#!/usr/bin/env python3

from hashbang import command

@command
def echo(message):
  print(message)
  
if __name__ == '__main__':
  echo.execute()