Python3 yield使用

yield 的作用就是把一个函数变成一个 generator,
带有 yield 的函数不再是一个普通函数,
Python 解释器会将其视为一个 generator

简单示例:

#encoding:UTF-8

def yield_test(n):

for i in range(n):

yield call(i)

print("i=",i)
#做一些其它的事情 

print("do something.") 

print("end.")


def call(i):

return i*2


#使用for循环

for i in yield_test(5):

print(i,",")

运行结果:

>>> 
0 ,
i= 0
2 ,
i= 1
4 ,
i= 2
6 ,
i= 3
8 ,
i= 4
do something.
end.
>>> 
从运行结果可以看到,下次迭代时代码从yield的下一跳语句开始执行。
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