Python 进口 function 与 package

Question

I want to import a function from another python file. The problem is that I either have to call it with file.function() or import it with from file import function .

Since my file contains only one function, I am looking for a way to import it directly with import file .

Answer 1

I don't understand the problem. Why not just:

from file import function

function(params)

Answer 2

Not sure why from file import function is an issue, but the only other way to do it (other than calling file.function() everythime) is to do from file import *

Answer 3

Not sure what the issue is with either option that you listed.

What you can do is turn your module (the file with the function you want to import) into a script by adding if __name__ == "__main__": to the end of your file like so:

# file.py
def function(...):
    ...

if __name__ == "__main__":
    import sys
    function(sys.argv[1])

then import it as import file .

Reference: https://docs.python.org/3/tutorial/modules.html#executing-modules-as-scripts

I personally don't see an issue with alternative you listed, but the docs do have this to say about what you're trying to achieve:

This is often used either to provide a convenient user interface to a module, or for testing purposes (running the module as a script executes a test suite).