How to Prevent Console Windows from Popping Up When Using os.system() and subprocess.call()?

Hiding Console Windows in os.system() and subprocess.call()

When using os.system() or subprocess.call() to execute commands, you may encounter an annoying console window popping up. This can disrupt your workflow and make your script appear unprofessional. Fortunately, there are ways to suppress this unwanted behavior.

To hide the console window, you can utilize the STARTUPINFO structure available in the subprocess module. Here's how it's done:

si = subprocess.STARTUPINFO()
si.dwFlags |= subprocess.STARTF_USESHOWWINDOW
#si.wShowWindow = subprocess.SW_HIDE # default
subprocess.call('taskkill /F /IM exename.exe', startupinfo=si)

Alternatively, you can set specific creation flags to prevent the console window from being created in the first place:

CREATE_NO_WINDOW = 0x08000000
subprocess.call('taskkill /F /IM exename.exe', creationflags=CREATE_NO_WINDOW)

These approaches will still result in a console process with handles for I/O, but it will be invisible and will not interfere with the user interface.

For a more thorough solution, you can enforce the child process to have no console at all:

DETACHED_PROCESS = 0x00000008
subprocess.call('taskkill /F /IM exename.exe', creationflags=DETACHED_PROCESS)

In this case, the child's standard handles will be 0, but you can redirect them to a file or pipe like subprocess.DEVNULL.

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