实验七

实验任务1

task1

实验源码

'''
银行账户
数据：持卡人姓名、账号、当前余额
操作：取款、存款、打印账户信息、返回账户余额
'''

class Account:
    '''一个模拟银行账户的简单类'''
    def __init__(self, name, account_number, initial_amount = 10):
        '''构造新账户'''
        self._name = name
        self._card_no = account_number
        self._balance = initial_amount

    def deposit(self, amount):
        '''存款'''
        self._balance += amount

    def withdraw(self, amount):
        '''取款'''
        if self._balance < amount:
            print('余额不足')
            return
        self._balance -= amount

    def info(self):
        '''打印账户信息'''
        print('持卡人姓名:', self._name)
        print('持卡人账号:', self._card_no)
        print('持卡人账户余额:', self._balance)

    def get_balance(self):
        '''返回账户余额'''
        return self._balance

def main():
    '''创建Account类对象，测试类'''

    print('测试账户1：'.center(30, '*'))
    a1 = Account('Bob', '5002311', 20000)
    a1.deposit(5000)
    a1.withdraw(4000)
    a1.info()

    print()

    print('测试账户2：'.center(30, '*'))
    a2 = Account('Joe', '5006692', 20000)
    a2.withdraw(10000)
    a2.withdraw(5000)
    a2.info()

if __name__ == '__main__':
        main()

运行测试截图

 

实验任务2

shape

实验源码

'''
shape.py是一个图形类模块
包括:
基类: 图形类Shape
派生类: 矩形类Rect, 圆形类Circle, 三角形类Triangle
'''

class Shape:
    '''形状基类'''
    def info(self):
        '''打印图形信息'''
        pass

    def area(self):
        '''计算面积'''
        pass

    def perimeter(self):
        '''计算周长'''
        pass

class Rect(Shape):
    '''
    矩形类, 继承自Shape
    属性：矩形左上角点的坐标、宽、高
    方法： 打印矩形信息，计算面积、周长
    '''
    def __init__(self, x = 0, y = 0, length = 2, width = 1):
        '''构造矩形对象，根据矩形左上角顶点坐标(x,y)和长、宽'''
        self._x = x
        self._y = y
        self._width = width
        self._length = length

    def info(self):
        print(f'矩形左上角顶点坐标: ({self._x}, {self._y})')
        print(f'矩形长: {self._length}')
        print(f'矩形宽: {self._width}')

    def area(self):
        return self._length * self._width

    def perimeter(self):
        return (self._length + self._width) * 2

class Circle(Shape):
    '''
    圆形类，继承自Shape
    属性：圆心坐标、半径
    方法： 打印圆信息，计算面积、周长
    '''
    def __init__(self, x = 0, y = 0, radius = 1):
        '''构造圆形对象，圆心坐标(x,y), 半径r'''
        self._x = x
        self._y = y
        self._r = radius

    def info(self):
        print(f'圆心: ({self._x}, {self._y})')
        print(f'半径: {self._r}')

    def area(self):
        return 3.14 * self._r * self._r

    def perimeter(self):
        return 2 * 3.14 * self._r

class Triangle(Shape):
    '''
    三角形类，继承自Shape
    属性：三边边长
    方法：打印三角形信息，计算周长、面积
    '''
    def __init__(self, a = 1, b = 1, c = 1):
        self._a, self._b, self._c = a, b, c

    def info(self):
        print(f'三角形三边长: ({self._a}, {self._b}, {self._c})')

    def area(self):
        s = (self._a + self._b + self._c) / 2
        ans = (s*(s - self._a)*(s - self._b)*(s - self._c)) ** 0.5
        return ans

    def perimeter(self):
        return (self._a + self._b + self._c)

# 测试类
def main():
    print('测试1：'.center(40, '*'))
    shapes_lst1 = [Circle(), Rect(), Triangle()]
    for t in shapes_lst1:
        t.info()
        print(f'面积: {t.area():.2f}')
        print(f'周长: {t.perimeter():.2f}')
        print()

    print('测试2：'.center(40, '*'))

    shapes_lst2 = [Circle(x=2, y=2, radius=10),
                   Rect(x=50, y=50, length=10, width=5),
                   Triangle(a=3, b=4, c=5)]
    for t in shapes_lst2:
        t.info()
        print(f'面积: {t.area():.2f}')
        print(f'周长: {t.perimeter():.2f}')
        print()

if __name__ == '__main__':
    main()

运行测试截图

task2

实验源码

from shape import Rect, Circle

shape_lst =[Rect(5,5,10,5), Circle(), Circle(1,1,10)]

for i in shape_lst:
    i.info()
    print(f'面积: {i.area(): .2f}')
    print(f'周长: {i.perimeter(): .2f}')
    print()

运行测试截图

 

实验任务3

task3

实验源码

import math

def func(x):
    m=0
    s=2
    y = 1/((2*math.pi)**0.5)/s * math.exp(-1/2*(((x-m)/s)**2))
    print(f'x = {x}, f = {y:.8f}')

func(1)
func(3)
func(5)
func(7)
func(9)

运行测试截图