How Can One Python File Execute Another?

How to Execute One Python File from Another

When working with multiple Python files, you may encounter the need to have one file execute another. Here are the recommended approaches:

1. Import as a Module

• Import the target file as a module using import file.
• This approach is secure, efficient, and allows code reuse as intended. If the target file is named file.py, omit the .py extension in the import statement.

2. exec Command (Caution: Insecure)

• Consider the exec command in Python 2 (execfile('file.py')) or in Python 3 (exec(open('file.py').read())).
• This method is generally discouraged due to security concerns and code instability.

3. Shell Process Spawning

• Use os.system('python file.py') to spawn a new shell process.
• This approach is least desirable, reserved for situations where the other methods are inappropriate.

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