Python public private

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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()

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