python入门

第一个入门案例

#!user/bin/env python
# -*- coding:utf-8 -*-

    print（“hello，word”）

1. if  else 例子

1. #!user/bin/env python
   # -*- coding:utf-8 -*-
   age=58
   thinkAge=input("age:")
   thinkAge=int(thinkAge)
   if age==thinkAge:
       print("you think is right")
   elif age>thinkAge:
       print("please think bigger")
   else:
       print("please thinking smaller")

2.While循环

count=0

age=54

while count<3:

    inputage = int(input("age:"))

    count += 1

    if age==inputage:

        print("you are right",age)

        break

    elif age>inputage:

        print("you think small")



    else:

        print("you think big")

3.while循环也有else

age=58
count=0
while count<3:
    count+=1
    thinkAge=int(input("age:"))
    if age==thinkAge:
        print("you are right")
        break
    elif age>thinkAge:
        print("small")
    else:
        print("bigger")
else:
    print("you can try three times,you can input!")

4.for循环入门打印0--9

for a in range(10):

    print(a)

 

5.for循环+if  elif

for i in range(3):

    age=int(input("age:"))

    if age==4:

        print("right")

        break

    elif age<4:

        print("you are small")

    else:

        print("big")

else:

    print("you childen is't to learn in 小学")

6.for隔行打印0开始的10个数，打印0,2,4,6,8

for a in range(0,10,2):

    print(a)

7.打1开始的10个数，打印1,3,5,7,9

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

    print(a)