(synapse_353) foo@vbar:$ python
Python 3.5.3 (default, Apr 10 2017, 19:09:11)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
Running from /home/foo/.pythonrc
Loading [os]
Loading [sys]
Loading [json]
Loading [base64]
Loading [logging]
Loading [collections]
Loading [pprint as pprint]
Reload not found in builtin, defining reload()
Bound "tab" as autocomplete key.
Done loading from [/home/foo/.pythonrc]
>>> def f1(a, b):
...  if a != b:
...   raise Exception
...  return str(a)
...
>>> def f2(a, b):
...  assert a == b
...  return str(a)
...
>>> import dis
>>> dis.dis(f1)
  2           0 LOAD_FAST                0 (a)
              3 LOAD_FAST                1 (b)
              6 COMPARE_OP               3 (!=)
              9 POP_JUMP_IF_FALSE       18

  3          12 LOAD_GLOBAL              0 (Exception)
             15 RAISE_VARARGS            1

  4     >>   18 LOAD_GLOBAL              1 (str)
             21 LOAD_FAST                0 (a)
             24 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
             27 RETURN_VALUE
>>> dis.dis(f2)
  2           0 LOAD_FAST                0 (a)
              3 LOAD_FAST                1 (b)
              6 COMPARE_OP               2 (==)
              9 POP_JUMP_IF_TRUE        18
             12 LOAD_GLOBAL              0 (AssertionError)
             15 RAISE_VARARGS            1

  3     >>   18 LOAD_GLOBAL              1 (str)
             21 LOAD_FAST                0 (a)
             24 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
             27 RETURN_VALUE
>>> exit()
(synapse_353) foo@vbar:$ python -O
Python 3.5.3 (default, Apr 10 2017, 19:09:11)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
Running from /home/foo/.pythonrc
Loading [os]
Loading [sys]
Loading [json]
Loading [base64]
Loading [logging]
Loading [collections]
Loading [pprint as pprint]
Reload not found in builtin, defining reload()
Bound "tab" as autocomplete key.
Done loading from [/home/foo/.pythonrc]
>>> def f2_o(a, b):
...  assert a == b
...  return str(a)
...
>>> import dis
>>> dis.dis(f2_o)
  3           0 LOAD_GLOBAL              0 (str)
              3 LOAD_FAST                0 (a)
              6 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
              9 RETURN_VALUE
>>>