proc.communicate not exiting on python subprocess timeout -


the script below (a python process called, calls waitfor cmd timeout of 4 seconds) supposed end after 4 seconds. instead proc.communicate stops after 20 seconds timeout.

why???

if __name__ == "__main__":   proc_str = ["c:\\program files (x86)\\anaconda3\\python.exe",                         "-c", "import    subprocess;subprocess.run('cmd /s /c waitfor g /t 200', shell=false, timeout=4)"]   proc = subprocess.popen(proc_str,                             stdin=subprocess.pipe,                             stderr=subprocess.pipe,                             stdout=subprocess.pipe,                             shell=false,                             universal_newlines=true)   (proc_out, proc_err) = proc.communicate(timeout=20)   if (proc.returncode == 0):      pass

everything works 100% ok if remove stdin/stderr/stdout parameters


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