def myYield2(): for i in range(3): yield ‘2222 i am in myYield2‘, ‘i = ‘, i def myYield(): for i in range(10): yield ‘0000 i am in myYield‘, ‘i = ‘, i for j in myYield2(): yield ‘1111 i am in for myYield2‘, ‘j = ‘, j f = myYield() print ‘KKK‘, f.next() print ‘KKK‘, f.next() print ‘KKK‘, f.next() print ‘KKK‘, f.next() print ‘KKK‘, f.next() print ‘KKK‘, f.next() print ‘KKK‘, f.next()
yield有一点像return, 返回的结果如下:
KKK (‘0000 i am in myYield‘, ‘i = ‘, 0) KKK (‘1111 i am in for myYield2‘, ‘j = ‘, (‘2222 i am in myYield2‘, ‘i = ‘, 0)) KKK (‘1111 i am in for myYield2‘, ‘j = ‘, (‘2222 i am in myYield2‘, ‘i = ‘, 1)) KKK (‘1111 i am in for myYield2‘, ‘j = ‘, (‘2222 i am in myYield2‘, ‘i = ‘, 2)) KKK (‘0000 i am in myYield‘, ‘i = ‘, 1) KKK (‘1111 i am in for myYield2‘, ‘j = ‘, (‘2222 i am in myYield2‘, ‘i = ‘, 0)) KKK (‘1111 i am in for myYield2‘, ‘j = ‘, (‘2222 i am in myYield2‘, ‘i = ‘, 1))
原文：http://www.cnblogs.com/zhang-pengcheng/p/4680991.html