零基础学Python 读《编程小白的第一本 Python 入门

第五章练习题

1. 设计这样一个函数，在桌面的文件夹上创建10个文本，以数字给它们命名。

def create_txt():
    desktop_path = '/Users/su/Desktop/'
    for name in range(1, 11):
        full_path = desktop_path + '{}.txt'.format(name)
        file = open(full_path, 'w')
        file.close()
    print('Done')


create_txt()

#尝试用while循环解决问题
def create_txt():
    desktop_path = '/Users/su/Desktop/'
    name = 11
    while name < 21:
        full_path = desktop_path + '{}.txt'.format(name)
        file = open(full_path, 'w')
        name = name + 1
        file.close()
    print('Done')


create_txt()


#书中给出的答案
def text_creation():
    path = '/Users/su/Desktop/'
    for name in range(1, 11):
        with open(path + str(name) + ' .txt', 'w') as text:
            text.write(str(name))
            text.close()
            print('Done')


text_creation()

2. 复利是一件神奇的事情，正如富兰克林所说：“复利是能够将所有铅块变成金块的石头”。设计一个复利计算函数 invest()，它包含三个参数：amount（资金），rate（利率），time（投资时间）。输入每个参数后调用函数，应该返回每一年的资金总额。它看起来就应该像这样（假设利率为5%）

def invest(amount, rate, time):
    print('principal amount:{}'.format(amount))
    for t in range(1, time + 1):
        amount = amount * (1 + rate)
        print('year {}: ${}'.format(t, amount))


invest(100, 0.05, 3)

3. 打印1～100内的偶数

def even_print():
    for i in range(1, 100):
        if i % 2 == 0:
            print(i)

print(even_print())

综合练习

1. 设计一个猜大小的小游戏

import random
def guess_big_small_game():
    yazhu = input('押注（big/small）:')
    if yazhu == 'big' or yazhu == 'small':
        point1 = random.randrange(1, 7)
        point2 = random.randrange(1, 7)
        point3 = random.randrange(1, 7)
        a_list = [point1, point2, point3]
        print(a_list)
        daxiao = sum(a_list)
        if 3 <= daxiao <= 9:
            daxiao = 'small'
            if yazhu == daxiao:
                print('<<<<<押对了>>>>>')
            else:
                print('-----不对-----')
                print('应该是',daxiao)
            guess_big_small_game()
        else:
            daxiao = 'big'
            if yazhu == daxiao:
                print('<<<<<押对了>>>>>')
            else:
                print('-----不对-----')
                print('应该是',daxiao)
            guess_big_small_game()
    else:
        print('输入不对,重新输入')
        guess_big_small_game()
guess_big_small_game()

这个代码虽然可以跑通，但看答案以后才明白，分别定义摇骰子和判断大小的函数，才能实现后期加入金额的设定，下面是重新写的

import random


def roll_dice(num=3, points=None):
    print('<<<<< ROLL THE DICE! >>>>>')
    if points is None:
        points = []
    while num > 0:
        point = random.randrange(1, 7)
        points.append(point)
        num = num - 1
    return points


def roll_result(total, num):
    isSmall = 1 * num <= total <= 3 * num
    isBig = 3 * num + 1 <= total <= 6 * num
    if isSmall:
        return 'small'
    elif isBig:
        return 'big'

def start_game():
    print('<<<<< GAME STARTS! >>>>>')
    your_dice_num = int(input('输入需要骰子的数量：'))
    choice = ['big', 'small']
    your_choice = input('big or small:')
    points = roll_dice(your_dice_num)
    result = roll_result(sum(points), your_dice_num)
    youWin = your_choice == result
    if your_choice in choice:
        if youWin:
            print('你赢了', points)
        else:
            print('押错了',points)
            start_game()
    else:
        print('invaild wrong')
        start_game()
start_game()

以上加入了选择骰子的数量，但是还是不够完善

练习题

一、在最后一个项目的基础上增加这样的功能，下注金额和赔率。具体规则如下：

• 初始金额为1000元；
• 金额为0时游戏结束；
• 默认赔率为1倍，也就是说押对了能得相应金额，押错了会输掉相应金额。
• 加入了选择骰子的数量
• 增加输入金额超出时的判断
• 增加对输入big or small 时输入的判断

import random


def roll_dice(num=3, points=None):
    print('<<<<< ROLL THE DICE! >>>>>')
    if points is None:
        points = []
    while num > 0:
        point = random.randrange(1, 7)
        points.append(point)
        num = num - 1
    return points


def roll_result(total, num):
    isSmall = 1 * num <= total <= 3 * num
    isBig = 3 * num + 1 <= total <= 6 * num
    if isSmall:
        return 'small'
    elif isBig:
        return 'big'


def start_game():
    money = 1000
    print('<<<<< GAME STARTS! >>>>>')
    your_dice_num = int(input('输入需要骰子的数量：'))
    while money > 0:
        print('你现在有{}元'.format(money))
        duzhu = int(input('输入你的赌注：'))
        if duzhu <= money:
            choice = ['big', 'small']
            your_choice = input('input big or small:')
            if your_choice in choice:
                points = roll_dice(your_dice_num)
                result = roll_result(sum(points), your_dice_num)
                youWin = your_choice == result
                if your_choice in choice:
                    if youWin:
                        print('你赢了', points)
                        money = money + duzhu
                        print('账户金额：', money)
                    else:
                        print('押错了,它是', points)
                        money = money - duzhu
                        print('账户金额：', money)
                        if money == 0:
                            print('你没钱了，游戏结束')
                else:
                    print('invaild wrong')
                    start_game()
            else:
                print('big or small')
        else:
            print('输入的金额不对，请重新输入')


start_game()

二、我们在注册应用的时候，常常使用手机号作为账户名，在短信验证之前一般都会检验号码的真实性，如果是不存在的号码就不会发送验证码。检验规则如下：

• 长度不少于11位；
• 是移动、联通、电信号段中的一个电话号码；
• 因为是输入号码界面，输入除号码外其他字符的可能性可以忽略；
• 移动号段，联通号段，电信号段如下：

CN_mobile = [134,135,136,137,138,139,150,151,152,157,158,159,182,183,184,187,188,147,178,1705]
CN_union = [130,131,132,155,156,185,186,145,176,1709]
CN_telecom = [133,153,180,181,189,177,1700]

def check_phone_num():
    CN_mobile = [134, 135, 136, 137, 138, 139, 150, 151, 152, 157, 158, 159, 182, 183, 184, 187, 188, 147, 178, 1705]
    CN_union = [130, 131, 132, 155, 156, 185, 186, 145, 176, 1709]
    CN_telecom = [133, 153, 180, 181, 189, 177, 1700]
    phone_num = input('你的电话号码：')
    if len(phone_num) == 11:
        p_num = int(phone_num[:3])
        if p_num == 170:
            p_num = int(phone_num[:4])
            if p_num in CN_mobile:
                print('移动号码，可以发信息了')
            elif p_num in CN_union:
                print('联通号码，可以发信息了')
            elif p_num in CN_telecom:
                print('电信号码，可以发信息了')
            else:
                print('哪有这种号码，重输！')
                check_phone_num()
        else:
            if p_num in CN_mobile:
                print('移动号码，可以发信息了')
            elif p_num in CN_union:
                print('联通号码，可以发信息了')
            elif p_num in CN_telecom:
                print('电信号码，可以发信息了')
            else:
                print('哪有这种号码，重输！')
                check_phone_num()
    else:
        if len(phone_num) > 11:
            print('多了，是11位，重输！')
            check_phone_num()
        else:
            print('不够11位,重输！')
            check_phone_num()


check_phone_num()

电话号码这里的or应该这样用

first_three in CN_mobile or first_four in CN_mobile

def check_phont_num():
    while True:
        number = input('Enter your number :')
        CN_mobile = [134, 135, 136, 137, 138, 139, 150, 151, 152, 157, 158, 159, 182, 183, 184, 187, 188, 147, 178, 1705]
        CN_union = [130, 131, 132, 155, 156, 185, 186, 145, 176, 1709]
        CN_telecom = [133, 153, 180, 181, 189, 177, 1700]
        first_three = int(number[:3])
        first_four = int(number[:4])
        if len(number) == 11:
            if first_three in CN_mobile or first_four in CN_mobile:
                print('Operator:China Mobile')
                print('We\'re sending verification code via text to your phone', number)
                break
            elif first_three in CN_union or first_four in CN_union:
                print('Operator:China Union')
                print('We\'re sending verification code via text to your phone', number)
                break
            elif first_three in CN_telecom or first_four in CN_telecom:
                print('Operator:China Telecom')
                print('We\'re sending verification code via text to your phone', number)
                break
            else:
                print('No such a operator')
        else:
            print('Invalid length,your number should be in 11 digits')
check_phont_num()

while ，只要输入的不对，就会一直重新输入