Python循環 if else、while、for

1、判斷用戶輸入的用戶名、密碼和設置的是否一致

 

import getpass
_username = "wangsong"
_password = "123456"
username = input("username:")
password = getpass.getpass("password")
if _username == username and _password == password:
　　print("Welcome user {name} login....".format(name=username))
else:
　　print("Invalid username or password")

 

2、使用while和if循環，猜年齡，最多允許猜3次，3次內猜對了直接跳出循環，輸錯三次則報錯。

#!/usr/bin/env python3.4
count = 0
while True:
    if count == 3:
        break
    age_of_wangsong = 25
    guess_age = int(input("Please guess age: "))
    if guess_age == age_of_wangsong:
        print("You guess successfuly...")
    elif guess_age < age_of_wangsong:
        print("You guess smaller...")
    else:
        print("You guess bigger...")
    count +=1

#!/usr/bin/env python3.4
count = 0
while count < 3:
    age_of_wangsong = 25
    guess_age = int(input("Please guess Age: "))
    if guess_age == age_of_wangsong:
        print("Wow you Get it...")
        break
    elif guess_age < age_of_wangsong:
        print("You guess smaller...")
    else:
        print("You guess bigger...")
    count +=1
else:
    print("you have tried too many times..fuck off")

 

3、使用for循環猜年齡，最多允許猜3次，3次內猜對了直接跳出循環，輸錯三次則報錯。

for i in range(3):
    age_of_wangsong = 25
    guess_age = int(input("guess age:"))
    if age_of_wangsong == guess_age:
        print("You guess it successfully")
        break
    elif age_of_wangsong > guess_age:
        print("You guess smaller...")
    else:
        print("You guess bigger...")

 

4、使用for循環打印0-9；使用for循環打印十以內偶數。

for i in range(10):
    print("loop",i)

for i in range(0,10,2):
    print("loop",i)

 

5、猜年齡，連續輸錯3次就問問用戶要不要繼續玩，如果想玩就繼續，不想玩就退出。

count = 0
while count < 3:
    age_of_wangsong = 25
    guess_age = int(input("guess_age: "))
    if guess_age == age_of_wangsong:
        print("You guess it successfuly...")
        continue_comfirm = input("Would you want to continue[Y/n]: ")
        if continue_comfirm != 'n':
            count = 0
        else:
            break
    if  guess_age < age_of_wangsong:
        print("You guess it smaller...")
        count +=1
        if count == 3:
            continue_comfirm = input("Would you want to continue[Y/n]: ")
            if continue_comfirm != 'n':
                count = 0
    if  guess_age > age_of_wangsong:
        print("You guess it bigger...")
        count +=1
        if count == 3:
            continue_comfirm = input("Would you want to continue[Y/n]: ")
            if continue_comfirm != 'n':
                count = 0