class People(object):
  def __init__(self,name):
    self.__name=name
  def getName(self):
    return self.__name
  def setName(self,newName):
    if len(newName) >= 5:
      self.__name = newName
    else:
      print("error:名字长度需要大于或者等于5")
xiaoming = People("monkey")
print(xiaoming.__name)

class People(object):
  def __init__(self,name):
    self.__name=name
  def getName(self):
    return self.__name
  def setName(self,newName):
    if len(newName) >= 5:
      self.__name = newName
    else:
      print("error:名字长度需要大于或者等于5")
xiaoming = People("monkey")
print(xiaoming.getName()) #这样就是通过调用方法来间接调用属性

class Dog:
  #私有方法，在方法名前面加上两个下划线
  def __test1(self):
    print("1")
  def test2(self):
    print("2")
dog=Dog()
dog.__test1() #报错
dog.test2()  #正确