# Imports & Your Own Modules — Python

Source: https://www.geekswithgeeks.com/en/python/py-import-system

> Split code across files and reuse it with import.

## import styles

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

```python
# 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.

```python
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`.