How to skip `if __name__ == "__main__"` in interactive mode?

Question

Given a simple script like:

#!/usr/bin/env python3

if __name__ == "__main__":
    print("Hello World")

How can I load that into the interactive interpreter without executing the if __name__ == "__main__": block? By default it gets executed:

$ python3 -i simple-script.py
Hello World
>>> █

Answer 1

Don't pass it as an argument, import it into the interpreter.

$ python3
>>> import simple_script
>>>

Answer 2

From within the script itself, you can detect if -i was passed by looking at the sys.flags.inspect flag:

import sys

if __name__ == '__main__':
    # code run with or without -i
    if not sys.flags.inspect:
        # code not run with -i

Answer 3

In addition to @DanielRoseman's answer, if you use the IPython or jupyter interpreter, you could use the %run magic with the -n flag:

-n __name__ is NOT set to ‘__main__’, but to the running file’s name without extension (as python does under import). This allows running scripts and reloading the definitions in them without calling code protected by an if __name__ == "__main__" clause.