python subprocess run vs popen

Veröffentlicht am: 22 Februar 2024
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in python, the subprocess module provides a way to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. two commonly used functions in the subprocess module are run() and popen(). in this tutorial, we will explore the differences between subprocess.run() and subprocess.popen() and provide code examples for better understanding.
the subprocess.run() function is a high-level interface for subprocess management. it was introduced in python 3.5 and is designed to simplify the process of running a command and waiting for it to complete. it returns a completedprocess instance containing information about the completed process, including the return code.
in this example, the subprocess.run() function is used to execute the 'ls -l' command. the stdout=subprocess.pipe argument captures the standard output, and text=true indicates that the output should be treated as a text.
the subprocess.popen() function provides a more flexible and low-level way to create and interact with processes. it returns a popen object that can be used to communicate with the process. this function is suitable for more complex scenarios where you need more control over the process, such as asynchronous communication.
in this example, subprocess.popen() is used to start the 'ls -l' command. the stdout=subprocess.pipe argument captures the standard output. the process.communicate() method is then used to wait for the process to finish and obtain the output.
return type:
wait for completion:

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