python executable not stoppable

[Yanwu Gu]

I have a simple python script that is printing time every second:

import time

while True:
  localtime = time.localtime()
  result = time.strftime("%I:%M:%S %p", localtime)
  print(result)
  time.sleep(1)

I use pyinstaller --onefile myclock.py to create an executable.

However, when I run the executable, i cant terminate it by ctrl c or ctrl z. Any idea why? Any work around?