There is a major idiom in Python for CLI.
if __name__ == '__main__':
This is in order to run the code in the if-clause only from executed on command line.
I’ll show same code like this on node.js.
hello.coffee works as a command and as a library. This provides a method ‘say’ if it’s library.
Here is an idiom for node.js.
if process.argv == __filename