for循环&生成器&map

 

def add(x,y):
    print(x+y)
    #return x+y
x = [1,2,3]
y = [4,5,6]
print('type(zip(x,y)):',type(zip(x,y)))#zip class
print('for i,j in zip(x,y)')
for i,j in zip(x,y):
    print(i+j)
print('for i,j in [(1,5),(2,6),(3,7)]')
for i,j in [(1,5),(2,6),(3,7)]:
    print(i+j)               #print 6,8,10
def gen(func,a,b):           #a,b为列表
    for item1, item2 in zip(a,b):
        yield func(item1,item2)
print('for i in gen(add,x,y)')
print('type(gen(add,x,y):)',type(gen(add,x,y)))#generator class
for i in gen(add,x,y):       #把func结果一次次迭代出来

    i                        #print 5,7,9
    #print(i)
result = map(lambda x,y:print(x+y),x,y)#返回元素为lambda结果的迭代器类
print('for i in map(lambda x,y:print(x+y),x,y)')
for i in result:
    i
    #print(i)#用于map(lambda x,y:x+y,x,y)