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