Python学习之函数及流程控制

#猜年龄大小，用户最多猜三次

age = 50

i = 0

while i < 3:

    guess_age = int(input("Please input your answer:"))

    if guess_age > age:

        print("too big...try again please")

    elif guess_age < age:

        print("too small...try again please")

    else:

        print("You guessed it!")

        break

    i += 1

    if i == 3:

#猜年龄，每隔三次询问是否继续玩

age = 50

for i in range(1,100):

    guess_age = int(input("Please input your answer:"))

    if guess_age > age:

        print("too big...try again please")

    elif guess_age < age:

        print("too small...try again please")

    else:

        print("You guessed it !")

    if i%3 == 0:

        choice = input("Would you like play again? yes or no")

        if choice == "yes":

            continue

        if choice == "no":

            break

    else:

        continue

#登录验证，输入错误三次锁定用户

f = open(‘c:/user_passwd.txt‘,‘r‘)

j = 3

system_user_name = str(f.readline())

system_passwd = str(f.readline())

f.close()

for i in range(1,5):

    user_name = str(input("Please input your UserID:"))

    password = str(input("passwd:"))

    if i == 3:

        s = open(‘c:/user_passwd.txt‘, ‘r+‘)

        s.write("\nlocked")

        s.close()

        print("This user is locked!")

        break

    else:

        if user_name + ‘\n‘ == system_user_name and password == system_passwd:

            print("Welcome" + user_name + ‘\n‘ + "Have a good time!")

            break

        else:

            j -= 1

            i += 1

            print("UserID or password is wrong,Please try once again and you have " + \              str(j) + ‘times choice‘)

Python学习之函数及流程控制

原文：http://altboy.blog.51cto.com/5440160/1911078