1.当类仅作为名称空间使用,如下
m.a=1 Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'm' is not defined
class m(): ... pass ...
m.x=5 m.y=8 m.y+m.x 13
2.创建一个类 #coding=utf-8
class Addrbookenter(object): #类定义 def init(self,nm,ph): #定义构造 self.name=nm self.phone=ph #print "createdance for ",self.name def updatephone(self,newph): #定义方法 self.phone=newphone #print "update phone for ",self.name
john=Addrbookenter("john","4001111") #创建实例 jane=Addrbookenter("jane","4001234")
print john.name print jane.phone
john.updatephone("4008888") #方法调用 print john.phone
#打印结果 john 4001234 4008888
3.经典类和新式类最大区别:所有新式类必须继承至少一种父类,如果没有子类化一个对象,就是定义了一个经典类 接上,创建子类; class Addrbookenter(object): #类定义 def init(self,nm,ph): #定义构造 self.name=nm self.phone=ph
def updatephone(self,newph): #定义方法
self.phone=newph
john=Addrbookenter("john","4001111") #创建实例 jane=Addrbookenter("jane","4001234")
print john.name print jane.phone
john.updatephone("4008888") #更新电话 print john.phone
class Empladdrbookenter(Addrbookenter): def init(self,nm,ph,id,em): Addrbookenter.init(self,nm,ph) #父类(nm和ph调用父类的值) self.empid=id self.email=em
def updateemail(self,newem):
self.email=newem
john=Empladdrbookenter("jonh","4002222","01","jone@qq.com")
print john.empid john.updateemail("hello@hotmail.com") print john.email
#打印结果: john 4001234 4008888 01 hello@hotmail.com