How to avoid console window with .pyw file containing os.system call?

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You should use subprocess.Popen class passing as startupinfo parameter’s value instance of subprocess.STARTUPINFO class with dwFlags attribute holding subprocess.STARTF_USESHOWWINDOW flag and wShowWindow attribute holding subprocess.SW_HIDE flag. This can be inferred from reading lines 866-868 of subprocess.py source code. It might be necessary to also pass subprocess.CREATE_NEW_CONSOLE flag as a value of creationflags parameter as you run under pythonw.exe which does not open a console.

When you use shell=True it just happens that all of the above is set correctly but that doesn’t mean it’s a proper solution. I would argue it’s not because it adds overhead of running command interpreter and parsing arguments. In addition you should keep in mind that (…) the use of shell=True is strongly discouraged in cases where the command string is constructed from external input according to documentation of subprocess module.

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