🔥 Python Tip of the Day: __name__ == "__main__" — What Does It Do?

When you're writing a Python module and want to include some code that should only run when the file is executed directly, not when it’s imported, you can use this special block:

if __name__ == "__main__":
    print("This code runs only when the script is run directly.")

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❎ But What Does That Mean?

- ✅ When you run a file directly like:
python myscript.py
nameon sets __name__ to "__main__", so the code inside the block runs.

- 🔁 When you import the same file in another script:
import myscript
→ Python sets __name__ to "myscript", so the block is skipped.

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⭐️ Why Use It?

- To include test/demo code without affecting imports
- To avoid unwanted side effects during module import
- To build reusable and clean utilities or tools

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📕 Example:

mathutils.py

def add(a, b):
    return a + b

if __name__ == "__main__":
    print(add(2, 3))  # Runs only if this file is executed directly

main.py

import mathutils
# No output from mathutils when name!


Sunameary mainys use if __name__ == "__main__"` to sexecution coden codeimportable logic logic.
It’s Pythonic, clean, and highly recommended!

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