实验七 面向对象编程与内置模块

class Account:
    def __init__(self,name,account_number,initial_amount=10):
        self._name=name
        self._card_no=account_number
        self._balance=initial_amount
    def deposit(self,amount):
        self._balance+=amount
    def withdraw(self,amount):
        if self._balance<amount:
            print('余额不足')
            return
        self._balance-=amount
    def info(self):
        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):
        return self._balance
def main():
    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()

 

'''
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:
    def info(self):
        pass

    def area(self):
        pass
    def preimeter(self):
        pass

class Rect(Shape):
    def __init__(self, x = 0, y = 0, length = 2, width = 1):
        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):
    def __init__(self, x = 0, y = 0, radius = 1):
        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):
    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)

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()

 

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()

 

from math import *
m = 0
s = 2
def func(x):
    return 1/(sqrt(2*pi)*s)*(exp((-0.5)*((x-m)/s)**2))


print(f'x = 1,f = {func(1):.8f}')
print(f'x = 3,f = {func(3):.8f}')
print(f'x = 5,f = {func(5):.8f}')
print(f'x = 7,f = {func(7):.8f}')
print(f'x = 9,f = {func(9):.8f}')