What is the optimal method for inserting Python code into a Python file?

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The optimal method for inserting Python code into a Python file is to first determine the appropriate location for the code based on its functionality and purpose. Once the location has been determined, the code should be carefully formatted and indented in accordance with PEP 8 guidelines. It is also recommended to include comments to explain the functionality and purpose of the code. Finally, the code should be tested thoroughly to ensure it works as intended and does not cause any errors or conflicts with existing code.