python定义类的私有成员_Python 类的公有、私有成员

我们先上结论┗( ▔, ▔ )┛

结论

__xx__:这种系统属性或方法，还没想好怎么测试，我们就看看用户自定义的吧

variate

from module import *

类外

继承

xx ：公有变量

✔

✔

✔

_xx ：单前置下划线

✘

✔

✔

__xx：双前置下划线

✘

✘

✘

from module import * 测试部分

a.py

name = "name"

_name = "_name"

__name = "__name"

test.py

from a import *

print(name)

# print(_name) #NameError: name '_name' is not defined

# print(__name) #NameError: name '__name' is not defined

类外 测试部分

class Person(object):

name = "name"

_name = "_name"

__name = "__name"

@staticmethod

def method():

print("method()")

@staticmethod

def _method():

print("_method()")

@staticmethod

def __method():

print("__method()")

instance = Person

print(instance.name) # name

print(instance._name) # _name

# print(instance.__name) # AttributeError: type object 'Person' has no attribute '__name'

instance.method() # method()

instance._method() # _method()

# instance.__method() #AttributeError: type object 'Person' has no attribute '__method'

继承 测试部分

class PersonChild(Person):

def out(self):

print(instance.name) # name

print(instance._name) # _name

# print(instance.__name) # AttributeError: 'PersonChild' object has no attribute '__name'

self.method() # method()

self._method() # _method()

# self.__method() # AttributeError: 'PersonChild' object has no attribute '__method'

instance = PersonChild()

instance.out()