Python Generator

>>> def make_counter(x): print(‘entering make_counter’) while True: yield x print(‘incrementing x’) x = x + 1 >>> counter = make_counter(2) >>> counter >>> next(counter) entering make_counter 2 >>> next(counter) incrementing x 3 >>> next(counter) incrementing x 4 >>> next(counter) incrementing x 5 >>> def fib(max): a,b = 0,1 while a < max: yield a a,b = b, a + b >>> for n in fib(1000): print(n,end = ‘ ‘) 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 >>> list(fib(1000)) [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987] >>> Python Generator の話