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 
#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 
#登录验证，输入错误三次锁定用户
f = open(&＃39;c:/user_passwd.txt&＃39;,&＃39;r&＃39;)
 
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(&＃39;c:/user_passwd.txt&＃39;, &＃39;r+&＃39;)
 
        s.write("\nlocked")
 
        s.close()
 
        print("This user is locked!")
 
        break
 
    else:
 
        if user_name + &＃39;\n&＃39; == system_user_name and password == system_passwd:
 
            print("Welcome" + user_name + &＃39;\n&＃39; + "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) + &＃39;times choice&＃39;)
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