python 基础语句

1、用户交换程序

import getpass
username = input('请输入你的名字：')
passwd = getpass.getpass('请输入密码')
age = input('请输入你的年龄：')
print("欢迎你来到python 姓名：%s 年龄：%s"%(username,age)

2、if else语句

age = input("请输入你的年龄")
if age.isdigit():
    if int(age) <20:
        print("你还年轻")
    elif int(age) >=20 and int(age)<=40:
        print("人到中年")
    else:
        print("你已经老了")

3、while循环

count = 0
while count <3:
    passwd = input('请输入密码：')
    if passwd == '123456':
        break
    count += 1
    if count == 3:
        countinue_confirm = input("是否继续 y/n:")
        if countinue_confirm == 'y':
            count = 0
else:
    print("你输入的过多")

4、for循环

new_flag = True
while new_flag:
    for i in range(0,10,2):
        if i >5:
            continue
        print('bad')
        print('loop',i)