>>> def loop():
...   i, j = 0, 0
...   while i < 100:
...     while j < 100:
...       if terminate: break
...       j += 1
...     if j < 100: break
...     i += 1
...   print(i, j)
...
>>> terminate = 0
>>> loop()
100 100
>>> terminate = 1
>>> loop()
0 0