Python public private

1. object # public

2. __object__ # special, python system use, user should not define like it

3. __object # private (name mangling during runtime)

4. _object # obey python coding convention, consider it as private

python有关private的描述，python中不存在protected的概念，要么是public要么就是private，但是python中的private不像C++, Java那样，它并不是真正意义上的private，通过name mangling（名称改编(目的就是以防子类意外重写基类的方法或者属性)，即前面加上“单下划线”+类名,eg：_Class__object）机制就可以访问private了。

1.class Foo():

2. def __init__():

3. ...

4.

5. def public_method():

6. print 'This is public method'

7.

8. def __fullprivate_method():

9. print 'This is double underscore leading method'

10.

11. def _halfprivate_method():

12. print 'This is one underscore leading method'

实例化Foo的一个对象，

1. f = Foo()

1. f.public_method() # OK

2.

3. f.__fullprivate_method() # Error occur

4.

5. f._halfprivate_method() # OK

6.

7. f._Foo__fullprivate()_method() # OK

class A(object):
def __init__(self):
self.__private()
self.public()
def __private(self):
print 'A.__private()'
def public(self):
print 'A.public()'
class B(A):
def __private(self):
print 'B.__private()'
def public(self):
print 'B.public()'
b = B()
初探
正确的答案是：
A.__private()
B.public()