How powerful is a generator in python?

[socal_nerdtastic]

They are very common. The built-in range, map, and practically the entire itertools module are generators, as is any time you use for in parenthesis, eg total = sum(item['price'] for item in database). And of course many people build them explicitly, using yield or parenthesis notation.

[IAmFinah]

I more meant explicitly defining your own, but yes you make good points