Скачать или смотреть Executing External Commands in Python

Learn how to call external commands within Python as if you had typed them in a shell or command prompt. Explore different methods and modules available for executing external commands in Python.
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When working with Python, you might often need to execute external commands, just like you would in a shell or command prompt. Python provides several ways to accomplish this task, depending on your requirements and the complexity of the command you want to execute.

Using the subprocess Module

The subprocess module in Python provides a powerful and flexible way to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. You can use the subprocess.run() function to execute an external command. Here's a basic example:

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This will execute the ls -l command as if you had typed it in a shell or command prompt.

Capturing Output

If you want to capture the output of the command, you can use the subprocess.run() function with capture_output=True:

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Handling Errors

The subprocess.run() function returns a CompletedProcess object that contains information about the execution of the command, including the return code. You can check the return code to determine if the command executed successfully:

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Using Shell Syntax

If you need to use shell syntax, you can set the shell parameter to True. However, be cautious when using shell=True as it may introduce security vulnerabilities if the command includes user input.

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Conclusion

Executing external commands within Python can be accomplished using the subprocess module. Whether you need to execute simple commands or more complex ones with shell syntax, Python provides the necessary tools to interact with external processes effectively.

Remember to handle errors appropriately and be cautious when using shell syntax, especially if the command involves user input or dynamic values.

By leveraging the subprocess module, you can integrate external commands seamlessly into your Python scripts and applications, enhancing their functionality and versatility.