method-resolution-order Questions
1
Solved
Two mixin classes specify requirements as abstract methods. Together, the classes have a full set of concrete methods. However, they fail to combine into a concrete class: no matter which order I u...
Caskey asked 13/6, 2020 at 15:48
3
Solved
I'm trying to use the new python dataclasses to create some mix-in classes (already as I write this I think it sounds like a rash idea), and I'm having some issues. Behold the example below:
from d...
Boote asked 30/1, 2020 at 12:47
5
Solved
What does mro() do?
Example from django.utils.functional:
for t in type(res).mro(): # <----- this
if t in self.__dispatch:
return self.__dispatch[t][funcname](res, *args, **kw)
Famine asked 6/1, 2010 at 3:4
9
Solved
I've found myself in an unusual situation where I need to change the MRO of a class at runtime.
The code:
class A(object):
def __init__(self):
print self.__class__
print "__init__ A"
self.hel...
Disarmament asked 29/12, 2013 at 6:48
2
Solved
I know the title is probably a bit confusing, so let me give you an example. Suppose you have a base class Base which is intended to be subclassed to create more complex objects. But you also have ...
Posh asked 17/12, 2020 at 11:3
3
I'm really confused by the following code sample:
class Meta_1(type):
def __call__(cls, *a, **kw): # line 1
print("entering Meta_1.__call__()")
print(cls) # line 4
print(cls.mro()) # line 5
...
Drayton asked 20/6, 2019 at 17:55
2
Solved
Suppose that I have defined four classes as following:
(The code has been tested on Python 3.6.5. However, I expected it should also works on Python 2.7.x with from __future__ import print_functio...
Sinkage asked 23/4, 2018 at 12:7
2
Solved
In Raymond Hettinger's talk "Super considered super speak" at PyCon 2015 he explains the advantages of using super in Python in multiple inheritance context. This is one of the examples that Raymon...
Extramarital asked 4/5, 2015 at 23:23
2
Solved
Consider this example where a subclass has a multi method with no signature and one with a slurpy parameter:
class Foo {
multi method do-it { put "Default" }
multi method do-it ( Int $n ) { put ...
Turbulent asked 12/7, 2017 at 2:13
1
Solved
I'm a newbie for MRO and having problem figuring out the logic for these outputs.
Case 1:
class A(object):
def save(self):
print "A"
class B(A):
def save(self):
print "B"
super(B, self).sav...
Devitalize asked 8/3, 2017 at 7:15
1
Solved
Example from Raymond Hettinger's recepie
class Root(object):
def draw(self):
# the delegation chain stops here
assert not hasattr(super(Root, self), 'draw')
class Shape(Root):
def __init__(se...
Fawn asked 18/3, 2017 at 6:1
2
Solved
Is there a difference between using super() and using the parent class name directly? For example:
class Parent:
def __init__(self):
print("In parent")
self.__a=10
class Child(Parent):
def __...
Sankaran asked 23/2, 2017 at 10:52
3
Solved
This is the code which I plan to use for my game, but it complains about an MRO error:
class Player:
pass
class Enemy(Player):
pass
class GameObject(Player, Enemy):
pass
g = GameObject...
Hobnailed asked 23/3, 2015 at 16:4
1
Solved
I have a problem with the Python MRO
For this code:
class F: pass
class G: pass
class H: pass
class E(G,H): pass
class D(E,F): pass
class C(E,G): pass
class B(C,H): pass
class A(D,B,E): pass
p...
Genesa asked 26/1, 2017 at 15:40
1
Solved
I was reading Python Multiple Inheritance (on Programiz) and then I found this StackOverflow question, Method Resolution Order (MRO) in new-style classes? but in this question some programmers like...
Emelda asked 8/11, 2016 at 2:50
1
Solved
On most types/classes in Python, I can call .mro() without arguments. But not on type and its descendants:
In [32]: type(4).mro()
Out[32]: [int, object]
In [33]: type(type(4)).mro()
-------------...
Fortunna asked 18/12, 2015 at 15:20
1
Solved
There are a lot of great resources on super(), including this great blog post that pops up a lot, as well as many questions on Stack Overflow. However I feel like they all stop short of explaining ...
Tyrocidine asked 22/10, 2015 at 21:15
2
Solved
I'd like to know the type of an instance obtained from super() function. I tried print(super()) and __print(type(super()))__
class Base:
def __init__(self):
pass
class Derive(Base):
def __init...
Detainer asked 14/8, 2015 at 16:4
4
Solved
In the book Python in a Nutshell (2nd Edition) there is an example which uses
old style classes to demonstrate how methods are resolved in classic resolution order and
how is it different with the ...
Stitch asked 4/12, 2009 at 17:30
1
Solved
functools.singledispatch helps to define a single-dispatch generic method. Meanwhile, there is super() for calling methods or accessing attributes of a superclass.
Is there something like super() ...
Siu asked 29/8, 2014 at 4:6
2
Solved
I have an inheritance hierarchy whereby some of the classes have a class property named e.g., 'pickled'. I would like to get A.pickled if it exists or None if not — even if A derives from many clas...
Alissaalistair asked 10/6, 2014 at 20:53
1
Solved
Given:
In [37]: class A:
....: f = 1
....:
In [38]: class B(A):
....: pass
....:
In [39]: getattr(B, 'f')
Out[39]: 1
Okay, that either calls super or crawls the mro?
In [40]: getattr(A, '...
Cipolin asked 10/6, 2014 at 21:10
2
Solved
How would I sort a list of classes in Python, making sure that any child class is before any of its parent classes in the list?
I ask because I want to see what type out of a list of types, an obj...
Songer asked 14/5, 2014 at 16:40
1
Solved
I have two classes:
class A(object):
def a(self):
pass
class B(A):
def b(self):
pass
print dir(A)
print dir(B)
How can I check from which class methods is derived in Python?
For example:
...
Thirteen asked 6/4, 2014 at 18:21
2
Solved
How does a super method actually works in python?
In the given code:
class A(object):
def test(self):
return 'A'
class B(A):
def test(self):
return 'B->'+super(B, self).test()
class C(...
Accra asked 5/4, 2014 at 10:9
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