>>> from dis import dis
>>> def f(a):
...  while 1:
...   a
...
>>> dis(f)
  2           0 SETUP_LOOP               7 (to 10)

  3     >>    3 LOAD_FAST                0 (a)
              6 POP_TOP
              7 JUMP_ABSOLUTE            3
        >>   10 LOAD_CONST               0 (None)
             13 RETURN_VALUE
>>> def g(a):
...  while True:
...   a
...
>>> dis(g)
  2           0 SETUP_LOOP              16 (to 19)
        >>    3 LOAD_GLOBAL              0 (True)
              6 JUMP_IF_FALSE            8 (to 17)
              9 POP_TOP

  3          10 LOAD_FAST                0 (a)
             13 POP_TOP
             14 JUMP_ABSOLUTE            3
        >>   17 POP_TOP
             18 POP_BLOCK
        >>   19 LOAD_CONST               0 (None)
             22 RETURN_VALUE
>>>