但是用for循环调用generator时,发现拿不到generator的return语句的返回值。如果想要拿到返回值,必须捕获StopIteration错误,返回值包含在StopIteration的value中:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
def fib(max):
n, a, b = 0, 0, 1
while n < max:
yield b
a, b = b, a + b
n = n + 1
return 'done'
# 捕获Generator的返回值
g = fib(6)
while True:
try:
x=next(g)
print('g=',x)
except StopIteration as e:
print('Generrator return value:', e.value)
break
输出:
g= 1
g= 1
g= 2
g= 3
g= 5
g= 8
Generrator return value: done