9.3.1 Generators

You can create your own iterator by using the keyword yield. For example, a generator for odd numbers smaller than  can be defined by:

def odd_numbers(n): 
    "generator for odd numbers less than n" 
    for k in range(n): 
        if k % 2 == 1: 
           yield k

Then you can use it as follows:

g = odd_numbers(10)
for k in g:
    ...    # do something with k

Or even like this:

for k in odd_numbers(10):
    ... # do something with k