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I'm currently using subprocess.call() to invoke another program, but it blocks the executing thread until that program finishes. Is there a way to simply launch that program without waiting for return?
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The subprocess module provides a function named call. This function allows you to call another program, wait for the command to complete and then return the return code.
Popen is more general than subprocess. call . Popen doesn't block, allowing you to interact with the process while it's running, or continue with other things in your Python program. The call to Popen returns a Popen object.
check_call will raise an exception if the command it's running exits with anything other than 0 as its status.
Popen is nonblocking. call and check_call are blocking. You can make the Popen instance block by calling its wait or communicate method.
Use subprocess.Popen instead of subprocess.call:
process = subprocess.Popen(['foo', '-b', 'bar']) subprocess.call is a wrapper around subprocess.Popen that calls communicate to wait for the process to terminate. See also What is the difference between subprocess.popen and subprocess.run.
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