Python面向对象练习题

类属性

代码

class Person(object):
    count = 0  # 类属性

    def __init__(self, name, age):
        Person.count += 1
        self.name = name
        self.age = age


# 创建对象
p1 = Person('张三', 18)
p2 = Person('李四', 21)
p3 = Person('王五', 22)

print(Person.count)

汽车类

代码

class Auto:
    def __init__(self, wheel_count=4, color='', weight=0, speed=0):
        self.wheel_count = wheel_count
        self.color = color
        self.weight = weight
        self.speed = speed

    def up_speed(self):
        self.speed += 1
        print('汽车加速')

    def down_speed(self):
        if self.speed > 0:
            self.speed -= 1
            print('汽车减速')

    def stop_car(self):
        self.speed = 0
        print('汽车停止了')

    def __str__(self):
        return "汽车属性：\n 颜色：{}\n 轮胎个数：{}\n 重量：{}\n 速度：{}\n".format(self.color, self.wheel_count, self.weight, self.speed)


class CarAuto(Auto):
    def __init__(self, ac, cd):
        super(CarAuto, self).__init__()
        self.ac = ac
        self.cd = cd

    def __str__(self):
        return "CarAuto:\n AC：{}\n CD：{}".format(self.ac, self.cd)

    def up_speed(self):
        self.speed += 1
        print('CarAuto加速')

    def down_speed(self):
        self.speed -= 1
        print('CarAuto减速')


a1 = Auto(4, '红色', 900, 80)
print(a1)
a1.up_speed()
a1.down_speed()
a1.stop_car()
print("\n")

c1 = CarAuto("制热", "")
print(c1)
c1.up_speed()
c1.down_speed()

银行账户类

代码

class Account(object):

    def __init__(self, name, balance):

        self.name = name

        self.balance = balance

    def save_money(self, money):

        assert isinstance(money, float) or isinstance(money, int), '请注意存钱数据的格式'

        self.balance += money
        print('存钱操作：{}， 当前余额：{}'.format(money,self.balance))

    def take_money(self, money):
        if self.balance < money:
            print('取钱操作：{}，余额不足，当前余额：{}'.format(money, self.balance))
        else:
          self.balance -= money
          print('取钱操作：{}， 当前余额：{}'.format(money, self.balance))

    def check_balance(self):
      return self.balance

a = Account('张三', 8000)

a.save_money(10000)

a.take_money(1000)

print('当前余额:', a.check_balance())

a.take_money(20000)

print('当前余额:', a.check_balance())

点与圆的关系

代码

import math


class Pointer:
    def __init__(self, x, y):
        self.x = x
        self.y = y


class Circle:
    def __init__(self, cp, radius):
        self.cp = cp
        self.radius = radius

    def num1(self):
        s = math.pi * self.radius ** 2
        c = 2 * math.pi * self.radius
        return f'圆的周长{c}，圆的面积{s}'

    def num2(self, obj):
        b = ((obj.x - p3.x) ** 2 + (obj.y - p3.y) ** 2) ** 1 / 2  # 点与圆心点之间的距离
        if b > self.radius:
            print('点在圆外')
        elif b < self.radius:
            print('点在园内')
        else:
            print('点在圆上')


p1 = Pointer(0, 0)  # 设置圆心点
c2 = Circle(p1, 5)  # 设置圆
p3 = Pointer(1, 2)  # 设置点
print(c2.num1())  # 圆的周长和面积
c2.num2(p1)

宠物店猫狗

代码

class PetShop():
    def __init__(self, name, pet_list):
        self.name = name
        self.pet_list = pet_list

    def show(self):
        if len(self.pet_list) == 0:
            print("还没有宠物呢！")
            return
        print("{}".format(self.name))
        for pet in self.pet_list:
            print(pet.__dict__)


class Pet(object):

    def __init__(self, name, gender, age, kind):
        self.name = name
        self.gender = gender
        self.age = age
        self.kind = kind

    def cry(self):
        pass

    def eat(self):
        pass

    def myprint(self):
        print(self.name, self.gender, self.age, self.kind)


class PetDog(Pet):
    def des_home(self):
        print(self.name + "拆家")

    def cry(self):
        print(self.name + "汪汪")

    def eat(self):
        print(self.name + "吃骨头")


class PetCat(Pet):
    def __init__(self, name, gender, age, kind, eye_color):
        self.eye_color = eye_color
        super().__init__(name, gender, age, kind)

    def cry(self):
        print(self.name + "喵喵")

    def play(self):
        print(self.name + "撒娇")

    def eat(self):
        print(self.name + "吃⻥")


dog = PetDog("小黄", "公", 2, "柴犬")
dog1 = PetDog("小黄1", "公", 3, "柴犬")
dog2 = PetDog("小黄2", "公", 4, "柴犬")
cat = PetCat("小美", "母", 2, "美短", "黑色")
cat1 = PetCat("小美1", "母", 3, "美短", "黑色")
cat2 = PetCat("小美2", "母", 4, "美短", "黑色")
ps = PetShop("shop", [dog, dog1, cat])
ps.show()
dog.eat()
dog.cry()
cat.eat()
cat.cry()

学生类列表

代码

class Grade():
    def __init__(self, class_name, list=None):
        self.class_name = class_name
        if list is None:
            list = []
        self.list = list

    def add_list(self, stu):
        self.list.append(stu.stu_list)

    def show(self):  # 1.查看该班级中的所有学生的信息
        print(self.list)

    def show_num(self, num):  # 2.查看指定学号的学生信息
        for i in self.list:
            if num in i[0]:
                print(i)
                break
        else:
            print("该学号的学生不存在。")

    def fail(self):  # 3.查看班级中成绩不及格的学生信息
        for i in self.list:
            if i[4] < 60:
                print(i)

    def sort(self):  # 4.将班级中的学生按照成绩降序排序
        for i in range(len(self.list) - 1):
            for j in range(len(self.list) - 1 - i):
                if self.list[j][4] < self.list[j + 1][4]:
                    self.list[j], self.list[j + 1] = self.list[j + 1], self.list[j]
        print(self.list)


class Student():
    def __init__(self, num, name, age, gender, score, stu_list=None):
        self.num = num
        self.name = name
        self.age = age
        self.gender = gender
        self.score = score
        self.stu_list = [self.num, self.name, self.age, self.gender, self.score]


grade = Grade("逆战班")
wm = Student("001", "王猛", 24, "男", 100)
grade.add_list(wm)
xm = Student("002", "小美", 24, "女", 99)
grade.add_list(xm)
zs = Student("003", "张三", 24, "男", 88)
grade.add_list(zs)
ls = Student("004", "李四", 24, "男", 40)
grade.add_list(ls)
# 1.查看该班级中的所有学生的信息
grade.show()
# 2.查看指定学号的学生信息
grade.show_num("001")
# 3.查看班级中成绩不及格的学生信息
grade.fail()
# 4.将班级中的学生按照成绩降序排序
grade.sort()