Python中的yield是什么意思

>>> mylist = [1, 2, 3]
>>> for i in mylist:
...    print(i)
1
2
3

>>> mylist = [x*x for x in range(3)]
>>> for i in mylist:
...    print(i)
0
1
4

>>> mygenerator = (x*x for x in range(3))
>>> for i in mygenerator:
...    print(i)
0
1
4

>>> def createGenerator():
...    mylist = range(3)
...    for i in mylist:
...        yield i*i*i
...
>>> mygenerator = createGenerator() # 创建一个generator
>>> print(mygenerator) # mygenerator 是一个对象
<generator object createGenerator at 0xb7555c34>
>>> for i in mygenerator:
...     print(i)
0
1
8