2018.09.14python学习第四天part3

流程控制之for循环

for循环主要用于循环取值

取列表：m=[1,2,3,4,5,6,7,8]

#用while循环取值

i=0
while i<len(m):
    print(i)
    i+=1

#用for循环取值

for i in m:
    print(i)

取字典：m={"x":4,"y":5,"z":6}

#用for取值

for k in m:
    print(k,dic[k])

 

ps:      

for a in range(1,10,2):
    print(a)

表示从1到10之中没隔2取一个值，顾头不顾尾