How to toggle a value in Python

Question

What is the most efficient way to toggle between 0 and 1?

Answer 1

Let's do some frame hacking. Toggle a variable by name. Note: This may not work with every Python runtime.

Say you have a variable "x"

>>> import inspect
>>> def toggle(var_name):
>>>     frame = inspect.currentframe().f_back
>>>     vars = frame.f_locals
>>>     vars[var_name] = 0 if vars[var_name] == 1 else 1

>>> x = 0
>>> toggle('x')
>>> x
1
>>> toggle('x')
>>> x
0