Why Isn\'t My Python `main()` Function Executing?

Confusion with Function Execution in Python Script

You've encountered an issue where your main() function doesn't execute when you run a Python script. To resolve this issue, it's important to understand the concept of function execution in Python.

In Python, merely declaring a function doesn't trigger its execution. To execute a function, you need to explicitly call it.

Consider the following code:

<code class="python">def main():
    print("boo")

# Call the main function
main()</code>

In this case, we first declare the main() function using the def keyword. However, this only defines the function; it doesn't run the code within it.

To execute the code inside the main() function, we need to call it explicitly. We do this by including the main() statement after the function declaration.

When you run this script, you will see the output "boo" printed to the console. This is because the main() function is now being called and executed.

Without calling the main() function, the Python interpreter simply ignores the code inside it. This is because Python doesn't automatically execute functions as soon as they are declared.

The above is the detailed content of Why Isn't My Python `main()` Function Executing?. For more information, please follow other related articles on the PHP Chinese website!