Comprehensions & Iterators

List/Set/Dict Comprehensions

squares = [x*x for x in range(5)]
evens = {x for x in range(10) if x%2==0}
d = {x: x*x for x in range(3)}

Generator Expressions

gen = (x*x for x in range(5))

Generators & Iterators

def mygen():
    yield 1
    yield 2
it = iter([1,2,3])
print(next(it))