实验7 面向对象编程与内置模块

task1

实验源码：

 1 #1
 2 class Account:
 3     def __init__(self,name,account_number,initial_amount=10):
 4         self._name=name
 5         self._card_no=account_number
 6         self._balance=initial_amount
 7 
 8     def deposit(self,amount):
 9         '''存款'''
10         self._balance+=amount
11 
12     def withdraw(self,amount):
13         '''取款'''
14         if self._balance<amount:
15             print('余额不足')
16             return
17         self._balance-=amount
18 
19     def info(self):
20         '''打印账户信息'''
21         print('持卡人姓名：',self._name)
22         print('持卡人账号：',self._card_no)
23         print('持卡人账户余额：',self._balance)
24 
25     def get_balance(self):
26         '''返回账户余额'''
27         return self._balance
28 
29 def main():
30     print('测试账户1：'.center(30,'*'))
31     a1=Account('Bob','5002311',20000)
32     a1.deposit(5000)
33     a1.withdraw(4000)
34     a1.info()
35 
36     print()
37 
38     print('测试账户2：'.center(30,'*'))
39     a1=Account('Joe','5006692',20000)
40     a1.deposit(10000)
41     a1.withdraw(5000)
42     a1.info()
43 
44 if __name__=='__main__':
45     main()

实验结果：

 task2

实验源码：

#2
class Shape:
    def info(self):
        pass

    def area(self):
        pass

    def perimeter(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 3.14*2*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()

实验结果：

 task3

实验源码：

#3
from math import *
def func(x):
    m=0
    s=2
    return (1/(2*pi)**0.5/s)*exp(-0.5*((x-m)/s)**2)

for i in range(1,10,2):
    print(f'x={i},y={func(i):.8f}')

实验结果：

 task4

实验源码：

#4.1
from random import choice
class RandomWalk():
    def __init__(self,num_points=5000):
        self.num_points=num_points
        self.x_values=[0]
        self.y_values=[0]

    def fill_walk(self):
        while len(self.x_values)<self.num_points:
            x_direction=choice([1,-1])
            x_distance=choice([0,1,2,3,4])
            x_step=x_direction*x_distance

            y_direction=choice([1,-1])
            y_distance=choice([0,1,2,3,4])
            y_step=y_direction*y_distance

            if x_step==0 and y_step==0:
                continue

            next_x=self.x_values[-1]+x_step
            next_y=self.y_values[-1]+y_step

            self.x_values.append(next_x)
            self.y_values.append(next_y)

def main():
    rw=RandomWalk(5)
    rw.fill_walk()
    print(rw.x_values)
    print(rw.y_values)

if __name__=='__main__':
    main()

实验结果：