According to Python's documentation, Data descriptors with __set__() and __get__() defined always override a redefinition in an instance dictionary. I have no problem understanding this senten...

I'm confused as to when to use a property vs a descriptor. I read that a property is a specialized descriptor. Can someone please post how this works?

This naive class attempts to mimic the attribute access of basic python objects. dict and cls explicitly stores the attributes and the class. The effect is that accessing .x of an instance will ret...

Say I define this descriptor: class MyDescriptor(object): def __get__(self, instance, owner): return self._value def __set__(self, instance, value): self._value = value def __delete__(self...

I have this code; class NumberDescriptor(object): def __get__(self, instance, owner): name = (hasattr(self, "name") and self.name) if not name: name = [attr for attr in dir(owner) if getattr(o...

I'm trying to create a Python property where in-place adding is handled by a different method than retrieving the value, adding another value and reassigning. So, for a property x on an object o, ...

Could you please let me know whether weblogic-application.xml can be added in a WAR file and if so, then how to do the same.

Or does the attribute have to be defined outside of any class methods? So my descriptor object is this. The IDN object already has some information about the UserNameField, so I want to use it. c...

I am trying to generate some class definitions dynamically (for wrapping a C++ extension). The following descriptor works fine except when I try to access the docstring for a field using help(), it...

I'm writing a python class that uses __setattr__ and __getattr__ to provide custom attribute access. However, some attributes can't be handled in a generic way, so I was hoping to use descriptors ...

I have recently stated trying to use the newer style of classes in Python (those derived from object). As an excersise to familiarise myself with them I am trying to define a class which has a numb...

I'm attempting to build a decorator for an instance method of a class that will memoize the result. (This has been done a million times before) However, I'd like the option of being able to reset t...

For example, its part of the Jikes RVM stack. at [0x70cfba90, 0x708cfaa4] Lorg/apache/lucene/index/SegmentInfos; **access$000**(Ljava/lang/String;)V at [0x70cfbb04, 0x708b55c8] Lorg/apache/luce...

I know if you want to add a method to a class instance you can't do a simple assignment like this: >>> def print_var(self): # method to be added print(self.var) >>> class MyClas...

Can I define a Python method to be both static and instance at the same time? Something like: class C(object): @staticmethod def a(self, arg1): if self: blah blah So that I can call i...

I'd like to be able to do this: class A(object): @staticandinstancemethod def B(self=None, x, y): print self is None and "static" or "instance" A.B(1,2) A().B(1,2) This seems like a problem ...

I want a script to redirect stdout and stderr to a file, do a bunch of stuff, then undo those redirections and take action on the file contents. I'm trying: function redirect(){ exec 3>&1 ...

How is __slots__ implemented in Python? Is this exposed in the C interface? How do I get __slots__ behaviour when defining a Python class in C via PyTypeObject?

I want to create a decorator that works like a property, only it calls the decorated function only once, and on subsequent calls always return the result of the first call. An example: def SomeCla...

I have a decorated function (simplified version): class Memoize: def __init__(self, function): self.function = function self.memoized = {} def __call__(self, *args, **kwds): hash = args try:...

This question is similar to this other one, with the difference that the data member in the base class is not wrapped by the descriptor protocol. In other words, how can I access a member of the b...