How Can I Run Background Processes in Python Like Shell Scripts Using '&'?

Background Process Initiation in Python

In the transition from shell scripts to Python, one common question is how to replicate the functionality of background processes. The original shell script employs "&" to initiate background processes, allowing them to operate independently of the script's completion. How can this be replicated in Python while ensuring the processes persist after the Python script concludes?

Python provides the answer through its module, subprocess. This module offers a modern and more refined approach to managing background processes. Its primary component, Popen, serves as a straightforward solution for background process initiation.

Consider this illustrative example:

This command will execute "rm -r some.file" in the background, effectively removing the specified file. It's important to note that calling .communicate() on the Popen object will block until the process completes. Hence, to maintain the background execution, avoid using this function.

For more complex process management scenarios, the subprocess module offers a range of options, as detailed in its comprehensive documentation.

While the term "background" in this context commonly refers to shell-style behavior, it's crucial to clarify that Python's concept of background processes revolves around the ability to create asynchronous processes that can run concurrently with the main script. This understanding ensures clarity when navigating this topic within the context of Python programming.

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