Python 面向对象之类class和对象基本用法示例

class MyClass(object):
  message = "hello,world"
  def show(self):
    print (self.message)

inst = Myclass() # 实例化一个MyClass 的对象
inst.show # 调用成员函数，无需传入self参数
hello,world

class MyClass(object):
  message = 'Hello, Developer.'
  def show(self):
    print self.message
  def __init__(self):
    print "Constructor is called"
inst = MyClass()
inst.show()
>>>

>>>Constructor is called
>>>Hello, Developer.

class MyClass(object):
  message = 'Hello, Developer.'
  def show(self):
    print self.message
  def __init__(self, name = "unset", color = "black"):
    print "Constructor is called with params: ",name, " ", color
  def __del__(self):
    print "Destructor is called!"
inst = MyClass()
inst.show()
inst2 = MyClass("David")
inst2.show()
del inst, inst2
inst3 = MyClass("Lisa", "Yellow")
inst3.show()
del inst3
>>>

def __init__(self, name = "unset", color = "black"):
  print "Constructor is called with params: ",name, " ", color
  self.name = name
  self.color = color

class MyClass(object):
  message = 'Hello, Developer.'
  def show(self):
    print (self.message)
    print ("Here is %s in %s!" % (self.name, self.color))
  @staticmethod
  def printMessage():
    print ("printMessage is called")
    print (MyClass.message)
  @classmethod
  def createObj(cls, name, color):
    print ("Object will be created: %s(%s, %s)"% (cls.__name__, name, color))
    return cls(name, color)
  def __init__(self, name = "unset", color = "black"):
    print ("Constructor is called with params: ",name, " ", color)
    self.name = name
    self.color = color
  def __del__(self):
    print ("Destructor is called for %s!"% self.name)
MyClass.printMessage()
inst = MyClass.createObj( "Toby", "Red")
print (inst.message)
del inst

class MyClass(object):
  def __init__(self, name = "unset", color = "black"):
    print "Constructor is called with params: ",name, " ", color
    self.__name = name
    self.__color = color
  def __del__(self):
    print "Destructor is called for %s!"% self.__name
inst = MyClass("Jojo", "White")
del inst