5月13日木叶下随机数和类

# 利用随机数模块，数值计算pi的值
import numpy as np
import random

x = np.random.random(10000)
y = np.random.random(10000)
n=0
for i in x:
    for j in y:
        if (i-1/2)**2+(j-1/2)**2 <= 1/4:
            n=n+1
            p = 4*n/(10000**2)
print (p)

# 写一个学生卡的类
class StudentCard:
    """A student information card."""
    def __init__(self, name, number, college, remainder):
        self.__name = name
        self.__number = number
        self.__college = college
        self.__remainder = remainder
    def get_name(self):
        return self.__name   
    def get_number(self):
        return self.__number
    def get_college(self):
        return self.__college
    def get_remainder(self):
        return self.__remainder
    def make_payment(self, price):
        if self.__remainder - price < 0:
            print ("您的余额不足！")
            return False
        else:
            self.__remainder -= price
            print (self.__remainder)
            return True 
        
card1 = StudentCard("张三", "2021212121", "物理院", 200)
card1.make_payment(10)
#dir(StudentCard)