在使用私有变量的时候：
class Stu(object):
def __init__(self, name):
self.__name = name
stu = Stu('xiaoming')
print(stu.__name)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-29-7ac3b468dec8> in <module>()
4
5 stu = Stu('xiaoming')
----> 6 print(stu.__name)
AttributeError: 'Stu' object has no attribute '__name'
那么怎么用呢？
最简单的是设置对应的函数来存取值：
class Stu(object):
def __init__(self, name):
self.__name = name
def setName(self, name):
self.__name = name
def getName(self):
return self.__name
stu = Stu('xiaoming')
print(stu.getName())
---------------------------------------------------------------------------
xiaoming
但这样可以说是相当麻烦了，使用property就可以简洁很多：
class Stu(object):
def __init__(self, name):
self.__name = name
def setName(self, name):
self.__name = name
def getName(self):
return self.__name
name = property(getName, setName)
stu = Stu('xiaoming')
stu.name='老王'
print(stu.name)
---------------------------------------------------------------------------
老王
再进化一次:
class Stu(object):
def __init__(self, name):
self.__name = name
@property
def name(self):
return self.__name
@name.setter
def name(self, name):
self.__name = name
stu = Stu('xiaoming')
stu.name='老张'
print(stu.name)
@property注释原get方法，函数名变为属性名
@属性名.setter注释原set方法，函数名变为属性名
函数内可以在赋值取值时执行操作
使用的时候直接使用属性名赋值取值
完
