python『学习之路01』循环语句任性玩

python 循环语句;

一 循环的基本用法及格式:.

while 循环:　 --- >>　当...条件时成立时执行语句体,

python  --- >> 格式:

　　while( 判断条件 ):

　　　　　语句体；

 java：----  >> 格式:

　　while( 判断条件 ){

　　　　　语句体；}

例：

　　i =0

　　while (i < 3):

　　　　print "good"     // ---->>当i小于3时,输出good

java: ------ >>

　　int i =0

　　while (i < 3):

　　　　System.out.println("good")     // ---->>当i小于3时,输出good

死循环:

while  True:

 　　print("我是死循环");

 java ------ >> 

while(true){

　　System.out.println("我是死循环");

}

for 循环:

for  i in index:

　　print i     // ------ >> 循环输出index的各字母:

 for i in range(0,10):

 　　print i   // ------- >>顺序输出0-9

'''

　　range中可携带三个参数:例 range(0,10,2) 

　　for i in range(0,10,2):

　　　　print i     // ----- >>  隔行打数, 每两个数打印一次:

'''

二 循环案例:

　　限定用户登录,每次登录失败提示剩余登录次数,登录成功调用猜数字游戏,  三次登录失败后提示账号锁定.三次猜数字机会，

　　猜测成功和三次三次猜测错误都给与提示,是否想再玩一次?， 是则重新开始猜数字游戏, 否则退出游戏.程序结束:

python 版 

用户登录:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2017/11/14 13:06
# @Author  : mixiu26
import guess as ges

#  定义已有用户名：
username = "admin"
password = "admin"
count = 0

while(count<3):#  用户输入账号密码:
    name = input("name: ")
    pwd = input("pwd: ")

    # 对已有用户名进行校验:
    if((username == name) and (password == pwd)):
        count += 1
        print("yes! you got it!")
        Guess= ges.GuessAge()
        Guess.guess()
        break;
    elif (2-count == 0):
        # 输入失败的过程中需要再次进行判断, 是否已经到达第三次, 当到达第三次时要告知用户账户已锁定:
        print("用户名或密码输入有误: ")
        print("对不起, 您的账户已被锁定,请与管理员联系: ")
        break;
    else:
        print("用户名或者密码输入有误: " + "您还有" +str((2 - count))+ "次机会")
        count += 1

for 循环 guess age：

#!/usr/bin/env python 
# -*- coding: utf-8 -*-
# @Time    : 2017/11/14 13:06
# @Author  : mixiu26

age_of_girl = 52
count = 0
chance = 'y'
# for 循环格式: ---- >> for i in range(循环次数) --->> i就代表我们循环的变量次数
for num in range(0,99999999999999999999):
    guess_age = int(input("guess age: "))
    if count <= 2:
        if guess_age == age_of_girl:
            print("yes, you got it!")
            count += 1
        elif guess_age >= age_of_girl:
            if count == 2:
                print("sorry, your guess age were too large and sorry, you have no chance. ")
            else:
                print("sorry, your guess age were too large , sorry,please try once again:")
            count += 1
        elif guess_age <= age_of_girl:
            if count == 2:
                print("sorry, your guess age were too small and: sorry, you have no chance. ")
            else:
                print("sorry, your guess age were too small , sorry,please try once again:")
            count += 1

    if ((guess_age == age_of_girl) or (count == 3 )):
        print("do you try once again? ")
        choice = input("your Choice: ")
        if(chance == choice):
            count=0
        else:
            print("Thank you! ")
            break;

while  --- >> 格式版

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2017/11/14 13:06
# @Author  : mixiu26
age_of_girl= 52
count = 0
chance = 'y'
while count <= 3:
    guess_age = int(input("guess age: "))
    if count <= 2:
        if guess_age == age_of_girl:
            print("yes, you got it!")
            count += 1
        elif guess_age >= age_of_girl:
            if count == 2:
                print("sorry, your guess age were too large and sorry, you have no chance. ")
            else:
                print("sorry, your guess age were too large , sorry,please try once again:")
            count += 1
        elif guess_age <= age_of_girl:
            if count == 2:
                print("sorry, your guess age were too small and: sorry, you have no chance. ")
            else:
                print("sorry, your guess age were too small , sorry,please try once again:")
            count += 1

    if ((guess_age == age_of_girl) or (count == 3)):
        print("do you try once again? ")
        choice = input("your Choice: ")
        if (chance == choice):
            count = 0
        else:
            print("Thank you! ")
            break;

1. java版代码实现:

import GuessGame.GuessNumber;

import java.util.Scanner;

/**
 * Created by mixiu26 on 2017/11/14.
 *
 * 模拟登录, 限定三次机会,每次输入都提示下次剩余机会数:
 *    登录成功后不立即退出,要求调用猜数字游戏:
 *
 */
public class StringTest2 {
    public static void main(String[] args) {
        //定义已有用户名/ 密码:
        String username = "admin";
        String password = "admin";

        //给定用户三次机会：
        for (int x = 0; x < 3; x++) {
            //创建键盘录入对象:
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入用户名: ");
            //键盘接收已输入用户名及密码:
            String name = sc.nextLine();
            System.out.println("请输入账户密码:");
            String pwd = sc.nextLine();
            //接收输入参数后将账户数据与原数据进行比对:
            if (username.equals(name) && password.equals(pwd)) {
                System.out.println("登录成功: ");
                // break;
                //调用猜数字游戏:
                GuessNumber.star();
                break;
            } else {
                //输入失败的过程中需要再次进行判断,是否已经到达第三次,当到达第三次时,要告知用户账户已锁定:
                if (2 - x == 0) {
                    System.out.println("用户名或者密码输入有误: ");
                    System.out.println("对不起, 您的账户已被锁定,请与管理员联系: ");
                } else {
                    //判断条件为用户名和密码都和原始数据相同时,才登录成功,所以else走的就是不相同的情况,不需要再加入条件判断：
                    System.out.println("用户名或者密码输入有误: " + "您还有" + (2 - x) + "次机会");
                }
            }
        }
    }
}

 guess 部分:

package GuessGame;

import java.util.Scanner;

/**
 * Created by mixiu26 on 2017/11/14.
 */

public class GuessNumber {
    private GuessNumber(){}  // 私有限定,禁止构造调用

    public static void star() {
        System.out.println("进入猜数字小游戏");
        int count = 0;
        //产生一个随机数:
        int number = (int)(Math.random() * 100) +1;
        //键盘录入数据,与随机数进行比较： ---- >> 要求限定三次机会,三次机会后进行询问是否还要继续玩游戏:
        Scanner sc = new Scanner(System.in);
        String chance = "y";
        for(; ;) {
            System.out.println("请输入您猜测的数据: ");
            int guessNumber = sc.nextInt();
            //比较两个数据是否相等：
            if(count<3) {
                if (guessNumber == number) {
                    System.out.println("yes, you got it! ");
                    count += 1;
                } else if (guessNumber > number) {
                    if (2 - count== 0) {
                        System.out.println("sorry, your guess age were too large and sorry, you have no chance.");
                    } else {
                        System.out.println("sorry, your guess age were too large , sorry,please try once again:");
                    }
                    count += 1;
                } else {
                    if (2 - count == 0) {
                        System.out.println("sorry, your guess age were too small and sorry, you have no chance.");
                    } else {
                        System.out.println("sorry, your guess age were too small , sorry,please try once again:");
                    }
                    count += 1;
                }
            }
            if ((guessNumber == number) || (count == 3)) {
                System.out.println("do you try once again? ");
                Scanner sc2 = new Scanner(System.in);
                String choice = sc2.nextLine();
                if(choice.equals(chance)){
                    count = 0;
                }else {
                    System.out.println("Thank you!");
                    break;
                }
            }
        }
    }
}