How to toggle a value in Python

Question

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

Answer 1

Trigonometric approach, just because sin and cos functions are cool.

>>> import math
>>> def generator01():
...     n=0
...     while True:
...         yield abs( int( math.cos( n * 0.5 * math.pi  ) ) )
...         n+=1
... 
>>> g=generator01() 
>>> g.next()
1
>>> g.next()
0
>>> g.next()
1
>>> g.next()
0