for迴圈：

for i in range(10):  # i迴圈10次
    print('------',i)
    for j in range(10):
        print(j)
        if j > 2 :
            break  #跳出迴圈體

while迴圈：

age_oldboy_guess = 50
conet = 0
# age_guess = int(input('age_oldboy_guess:'))
# if age_oldboy_guess == age_guess:
#     print('猜對了！')
#     print('get over！')  # 這一段已經寫多餘了。。
 

#     exit()
# else:
#     print('猜錯了！')
while conet < 3 :
# for i in range(3):
    age_guess = int(input('age_oldboy_guess:'))
    if age_oldboy_guess == age_guess:
        print('猜對了！')
        break
    else:
        print('猜錯了！')
    conet += 1
# else:
#     print("遊戲結束!")

    if conet == 3:
        i = input('還想玩嗎？繼續請輸入Y/y:')
 

        if i == 'Y' or i =='y':
            conet = 0
        else:
            break
print('get over!')

if--else迴圈：

name = input('name:')
sex = input('sex:')
age = int(input('age:'))

if sex == "f":
    if age < 28 :
        print("I LOVE girl！")
    else:
        print('2222！')
else:
    print("1111")