Python yield

def fun1():

         for i in range(1,5):

                  return i

def fun2():

          for i in range(1,5):

                   print i

def fun3():

           for i in range(1,5):

                    yield i

print fun1()         >>>return只返回一次，仅一次，就跳出

print "--------------\n"

print fun2()        >>>print 循环n次

print "--------------\n"

print "yield function"

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x = []

x = fun3()      >>>将yield当成一个与数组有关的

for i in x:

         print i,"xxx:::”

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