python中property属性的介绍及其应用详解

class Test:
  def __init__(self):
    self.__num = 100
  @property
  def num(self):
    print("--get--")
    return self.__num
  @num.setter
  def num(self, num):
    print("--set--")
    self.__num = num
t = Test()
print(t.num)
t.num = 1
"""
--get--
100
--set--
"""

class Test:
  def __init__(self):
    self.__num = 100
  def setNum(self, num):
    print("--set--")
    self.__num = num
  def getNum(self):
    print("--get--")
    return self.__num
  # 注意：要先写get方法，再写set方法
  aa = property(getNum, setNum)
t = Test()
print(t.aa)
t.aa = 1