#!/usr/bin/env python3
# -*- coding: utf-8 -*-

s = (x * x for x in range(5))
print(s)
for x in s:
    print(x)


def fib(max):
    n, a, b = 0, 0, 1
    while n < max:
        yield b
        a, b = b, a + b
        n = n + 1
    return "done"


f = fib(10)
print("fib(10):", f)
for x in f:
    print(x)

# call generator manually:
g = fib(5)
while 1:
    try:
        x = next(g)
        print("g:", x)
    except StopIteration as e:
        print("Generator return value:", e.value)
        break