w chun wrote: >> I have missed protected method/variables in Python. How do you declare >> methods/variables used only by a class and their derived classes? > > hi Ktalà, > > welcome to Python! you missed "protection" in OOP with Python bceause > there are no such declarations in Python! > > 1) there is a privacy *hint*, which is using "__" to start a variable > or method name with, e.g., def __myMaybePrivateMethod(self,...). > this does name-mangle the attribute at run-time, however the algorithm > is fairly well-known and easy to crack: > self._CLASS__myMaybePrivateMethod(). for more on this see,: > http://docs.python.org/tut/node11.html#SECTION0011600000000000000000
1a) start a variable name with _ which is a hint to users of the class that the variable is for internal use only. > - you can use __slots__ to restrict arbirtrary creation of (dynamic) > instrance attributes You can do this, but it is generally considered a misuse of __slots__ and potentially problematic. Python takes the attitude that "we're all adults here" and doesn't try to hide anything. The _ naming convention is part of this culture - you tell the users to keep hands off, but if they don't, on their head be it! Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
