关于Python类的基本用法- student类

class Student:
    count = 0 # class variable
    
    def __init__(self, name, id):
        print('Constructor called')
        self.name = name
        self.id = id
        Student.count += 1
        self.grades = {}
        
    def __del__(self):
        print('Destructor called')
        
    def getStudentNumber(self):
        return Student.count
    
    def addGrade(self, key, value):
        self.grades[key] = value
        
    def getGrade(self, key):
        return self.grades[key]
        
    def printGrade(self):
        for key in self.grades:
            print(key + ':' + self.grades[key])

类的用法是Python最基本的用法， Python用时具备面向对象和面向过程的高级编程脚本语言， 类在编写项目时更能体现出面向过程的强大功能。

1. count为类变量， 直接可以引用。
   加入object

s = Student('Steve', '98765')

s.addGrade('Math', '90')

s.addGrade('Physics', '80')

s.printGrade()

Math:90
Physics:80

mathgrade = s.getGrade('Math')
print(mathgrade)

90

count = s.getStudentNumber()
print(count)

1

print(s.count)
1

del s

删除object s