Day1-while and for/break and continue

一、while and for

需求：猜年龄，输错三次退出，猜对退出

解决1：

age_of_oldboy = 56
count = 0
while True:
    if count == 3:
        print("输错三次，不能再猜了")
        break
    guess_age = int(input("guess age:"))
    if guess_age == age_of_oldboy:
        print("Great,you got it")
        break
    elif guess_age > age_of_oldboy:
        print("猜大了")
    else:
        print("猜小了")
    count += 1

执行结果：

guess age:11
猜小了
guess age:57
猜大了
guess age:234
猜大了
输错三次，不能再猜了

解决2：while优化版

 age_of_oldboy = 56
 count = 0
 while count<3:
     guess_age = int(input("guess age:"))
     if guess_age == age_of_oldboy:
         print("Great,you got it")
         break
     elif guess_age > age_of_oldboy:
         print("猜大了")
     else:
         print("猜小了")
     count += 1

for循环：

解决3：for循环实现

 age_of_oldboy = 56
 count = 0
 for count in range(3):
     guess_age = int(input("guess age:"))
     if guess_age == age_of_oldboy:
         print("yes, you got it...")
         break
     elif guess_age > age_of_oldboy:
         print("think smaller...")
     else:
         print("think bigger!")
 else:
     print("you have tried too many times...fuck off")

输错n次时，退出

 age_of_oldboy = 56
 count = 0
 while count <3:
     guess_age = int(input("guess age:"))
     if guess_age == age_of_oldboy:
         print("yes, you got it...")
         break
     elif guess_age > age_of_oldboy:
         print("think smaller...")
     else:
         print("think bigger!")
     count +=1
     if count == 3:
         countine_confirm = input("do you want to keep guessing...：")
         if countine_confirm != 'n':
             count = 0
执行结果：

guess age:45
think bigger!
guess age:123
think smaller...
guess age:123123
think smaller...
do you want to keep guessing...?5
guess age:123

二、break and continue

 for i in range(5):
     print('---------',i)
     for j in range(5):
         print(j)
         if j >1:
             break   #跳出整个循环，该例子是跳出for j in range(5)的循环
执行结果:

--------- 0
0
1
2
--------- 1
0
1
2
--------- 2
0
1
2
--------- 3
0
1
2
--------- 4
0
1
2

 for i in range(5):
     print('---------',i)
     for j in range(5):
         print(j)
         if j >1:
             continue  #continue是结束本次循环，即j=1时结束循环不再往下执行语句，直接跳到print(j)执行
执行结果：

--------- 0
0
1
2
3
4
--------- 1
0
1
2
3
4
--------- 2
0
1
2
3
4
--------- 3
0
1
2
3
4
--------- 4
0
1
2
3
4