"Privatization" in Python-oriented objects

"Privatization" in Python-oriented objects

Python does not directly support private methods, but relies on the programmer to grasp the timing of the external feature modification.

To make a method or feature private (inaccessible from outside), simply precede its name with a double underline.

__properties that start with a double underscore are "confused" at run time, so direct access is not allowed.

In fact, in Python, properties or methods with double underscores are not private in the true sense, and they can still be accessed.

In the internal definition of a class, all names that begin with a double underscore are "translated" into the form preceded by a single underscore and a class name .

Example:

>>>classTestobj (object): ...__war=" World"...     ...     def __init__(self): ... self.__har="Hello"...         ...     def __foo(self): ...Print(self.)__har+ Self.__war)...         ...     ...>>> T =testobj ()>>> dir (t)#get all the methods inside T['_testobj__foo','_testobj__har','_testobj__war','__class__','__delattr__','__dict__','__dir__','__doc__','__eq__','__format__','__ge__','__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']>>> T.__warTraceback (most recent): File"<input>", Line 1,inch<module>T.__warAttributeerror:'Testobj'object has no attribute'__war'>>> T.__harTraceback (most recent): File"<input>", Line 1,inch<module>T.__harAttributeerror:'Testobj'object has no attribute'__har'>>>T.foo () Traceback (most recent): File"<input>", Line 1,inch<module>T.foo () Attributeerror:'Testobj'object has no attribute'Foo'>>>T._testobj__war' World'>>>T._testobj__har'Hello'>>>T._testobj__foo () HelloWorld

"Privatization" in Python-oriented objects