Python 静态方法和类方法

#! /usr/bin/python3.4

class Student():
	school = 'one'
	__num = 0
	@staticmethod #静态方法
	def staticShowName(name):#不需要实例
		print("name: " + name)
		print("school Name: " + Student.school)

	@classmethod # 类方法
	def allStudents(cls):
		return cls.__num

	@classmethod
	def addStudent(cls):
		cls.__num += 1

	def showYear(self,num):
		print("year: " + str(num))

	def __new__(self):#使用魔术函数__new__,在创建实例的时候调用人数累加
		Student.addStudent()
		return super(Student, self).__new__(self)

class myStudent(Student):
	school = 'two'


if __name__ == "__main__":
	myStudent.staticShowName("zhang") #不需要创建类的实例即可访问,与普通函数无异
	a = myStudent()
	a.staticShowName("liu") # 也可以通过实例访问,与实例并没有关系
	a.showYear(21)
	
	print("--------------")

	myStudent.staticShowName("wang")	
	b = myStudent()
	b.showYear(22)
	
	print("--------------")
	
	num = Student.allStudents()
	print("num = " , num)
	

结果: