username = ‘gyc‘
password = ‘gyc‘

u = input("what is you name?:")
p = input("mima:")

print(u,p)

#! /usr/bin/env python3.5
# *-* coding:utf-8 *-*

gyc = 18
age = int(input("请输入gyc的年龄："))
if age == 18: #判断用户输入的值是否与初始值匹配
    print("very good!")
else: #否则，错误！
    print("对不起，你不是gyc！")

gyc = 18
nub = 0
while True:  #循环条件为真
    nub += 1
    if nub == 3:
        print("结束")
        break
    age = int(input("请输入gyc的年龄："))
    if age == 18:
        print("very good!")
    else:
        print("对不起，你不是gyc！")

#! /usr/bin/env python3.5
# *-* coding:utf-8 *-*

gyc = 18
nub = 0
while nub <= 3:
    nub +=1
    age = int(input("请输入gyc的年龄："))
    if age == 18:
        print("very good!")
    else:
        print("对不起，你不是gyc！")

gyc =(‘I love you‘)
nub = 0
while nub < 4:
    nub += 1
    g = input("请输入我爱你的英文：")

    if g == gyc:
        print("I love you me too!")
        break #当然输入的与初始化的匹配，会结束循环，不在往下执行
    else:
        print("请输入 I love you")

for i in range(10):
    if i % 2 == 0:
        continue  #当 i 整除 2 时  跳出当前循环 执行下一条件
    print(i)
输出结果为 1 3 5 7 9