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myyield.py
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63 lines (48 loc) · 1.47 KB
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# encoding: utf-8
"""
Topic: sample
Desc :
Python生成器：生成器是一个带有yield语句的函数。
一个生成器能暂停并返回一个中间结果，返回这个值给调用者并暂停执行。
当生产器的next()方法被调用时，它会准确的从离开的那个地方继续
"""
from random import randint
__author__ = 'Xiong Neng'
# 生成器函数定义
def simpleGen():
yield 1
yield '2--->punch'
def gendemo():
print(simpleGen().__next__())
print(simpleGen().__next__())
# 生成器对象的获取
a = simpleGen()
print(a.__next__())
print(a.__next__())
# Python的for循环有next()调用和对StopIteration的处理
# 天生就是使用生成器的好手段
for eachItem in simpleGen():
print(eachItem)
# 序列的随机迭代器 pop index out of range ？？？？？？
def randGen(alist):
while len(alist) > 0:
yield alist.pop(randint(0, len(alist)))
def counter(start_at=0):
print('new start...%d' % (start_at,))
count = start_at
while True:
val = (yield count)
print('count=%s, val=%s' % (count, val,))
if val is not None:
count = val
else:
count += 1
if __name__ == '__main__':
count = counter(5)
print(count.__next__())
print(count.__next__())
print(count.__next__())
print(count.send(99))
print(count.__next__())
count.close()
# print(count.next()) # ERROR