python学习之路day1

学习总结：

　　变量，字符的由来，python2和python3的区别，控制语句：if，for，while，break，continue用法

学习示例：

　if用法1：判断年龄

# -*- coding: utf-8 -*-
# Author:Yang Hang

age = 75

guess_age = input("请输入年龄：")
guess_age = int(guess_age)

if guess_age == age:
    print("你猜对了！")
elif guese_age > age:
    print("请往小的猜！")
else:
    print("请往大的猜！")

 　　if用法2：登陆示例

# -*- coding: utf-8 -*-
# Author:Yang Hang

_username = 'yanghang'
_passwd = '123456'

username = input("username:")
passwd = input("password:")

if username == _username and passwd == _passwd:
    print("成功登陆！")
else:
    print("用户名或密码有误，请重新输入！")

　　for用法1：输出1到10

# -*- coding: utf-8 -*-
# Author:Yang Hang

for i in range(10):
    print("loop",i)

　　for用法2：猜年龄

# -*- coding: utf-8 -*-
# Author:Yang Hang

age = 75
count = 0


for i in range(3):
    guess_age = int(input("请输入年龄："))
    if guess_age == age:
        print("恭喜你猜对了！")
        break
    elif guess_age > age:
        print("请往小的猜！")
    else:
        print("请往大的猜！")
else:
    print("输入次数超过三次，结束")

　　while用法1：

# -*- coding: utf-8 -*-
# Author:Yang Hang

count = 0
while count < 100:
    print("count:",count)
    count = count +1

　　while用法2：

# -*- coding: utf-8 -*-
# Author:Yang Hang

age = 75
count = 0
'''
#版本1:
while True:
    if count == 3:
      print("输入次数超过三次，结束")
        break
guess_age = int(input("请输入年龄："))
if guess_age == age:
    print("恭喜你猜对了！")
    break
elif guess_age > age:
    print("请往小的猜！")
else:
    print("请往大的猜！")
count += 1
'''
#优化版本
while count <3:
    guess_age = int(input("请输入年龄："))
    if guess_age == age:
        print("恭喜你猜对了！")
        break
    elif guess_age > age:
        print("请往小的猜！")
    else:
        print("请往大的猜！")
    count +=1
    if count == 3:
        countine_confirm =input("你还想继续猜吗..?")
        if countine_confirm != 'n':
            count = 0
else:
    print("输入次数超过三次，结束")