Imports & Your Own Modules

import styles

Any .py file is a module. import brings its names in; from ... import ... brings specific names directly.

# mathutils.py
def add(a, b):
    return a + b

# main.py
import mathutils
from mathutils import add as add_numbers

print(mathutils.add(2, 3))
print(add_numbers(2, 3))

__name__ == "__main__"

if __name__ == "__main__": guards code that should run only when the file is executed directly — not when it's imported by another file.

def main():
    print("Running as a script")

if __name__ == "__main__":
    main()

Packages

A package is a folder of modules with an __init__.py file, letting you organize related code under one import path like myapp.utils.