---
title: "What is the purpose of if __name__ == \"__main__\": in Python?"  
description: "What is the purpose of if __name__ == \"__main__\": in Python?"  
author: "ICSM Computer"  
published: 2025-03-27  
updated: 2025-04-08  
canonical: https://www.mindstick.com/forum/161372/what-is-the-purpose-of-if-__name__-__main__-in-python  
category: "python"  
tags: ["python"]  
reading_time: 2 minutes  

---

# What is the purpose of if __name__ == "__main__": in Python?

What is the [purpose](https://yourviews.mindstick.com/view/247/no-fail-policy-failing-its-purpose) of `if __name__ == "__main__":` in Python?

## Replies

### Reply by Khushi Singh

The if `__name__` == `"__main__"`: line in Python controls the execution of script code based on direct execution or import usage as a module.

## Purpose

A Python file execution triggers the built-in variable __name__ with a specific value. When running a file directly, the built-in __name__ variable receives a value of "__main__". When a script functions as a module through import, then __name__ receives the module name, which excludes the `'.py'` extension.

The conditional block surrounding selected code blocks gives you a way to optimize runtime execution.

```python
if __name__ == "__main__":
   # Code to execute only if run directly
```

The code block executes only under conditions where the script runs directly instead of being loaded through other imports.

## Why It’s Useful

- The practice allows you to import functions, classes, and variables from other scripts without causing extra code execution.
- The structure enables clean division of testing functions from the main execution code and demonstration examples.
- Code modules become more easily reusable while their maintenance becomes enhanced.

## Example

```python
def greet():
   print("Hello from greet function!")
if __name__ == "__main__":
   greet()
   print("This script is being run directly.")
```

Running this file leads to displaying both lines; however, importing the file into another program provides access to greet() alone. Other files accessing this module will only receive the greet() function since the print statements remain unavailable for automatic execution. The approach for managing files using import is standard practice in [Python](https://www.mindstick.com/articles/65137/what-is-python-programming) platform development.


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