[Python] subprocess.Popen terminate() not stopping batch file

The following code is supposed to stop the batch file counting down to ZERO when the KeyboardInterrupt error is called. But it is not doing so.

with open('test.bat', 'w', encoding='utf-8') as file: file.write('@echo off\nTIMEOUT /t 20')
with open('test.txt', 'w', encoding='utf-8') as file: file.write('test file')

p1 = None
SW_HIDE = 1
info = subprocess.STARTUPINFO()
info.dwFlags = subprocess.STARTF_USESHOWWINDOW
info.wShowWindow = SW_HIDE
p1 = subprocess.Popen('test.bat', startupinfo=info, creationflags=CREATE_NEW_CONSOLE)
print(f"Subprocess started with PID: {p1.pid}")
try:
while p1.poll() is None: time.sleep(0.5)
except KeyboardInterrupt as e:
print('program ended')
p1.terminate(); p1.wait()
os.remove('test.txt')
quit()

print('continue code')
os.remove('test.txt')

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