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import subprocess as sp;sp.Popen('calc')not waiting for the subprocess to complete. It seems the creationflags aren't necessary. What am I missing?cmdinstance from which you started thecalc.DETACHED_PROCESSincreationflagsavoids this by preventing the child from inheriting or creating a console. If you instead want a new console, useCREATE_NEW_CONSOLE(0x00000010).os.devnullbecause some console programs exit with an error otherwise. Create a new console when you want the child process to interact with the user concurrently with the parent process. It would be confusing to try to do both in a single window.