All Questions
Tagged with inheritance python
4,622
questions
0
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1
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54
views
What are the differences between using mutiple or'ed typehints vs abc and an inheritance hierachy in Python?
Python is a dynamic language. This means that types are dynamic at runtime and Python makes use of the concept of Ducktyping.
What this means is that for any object x was can do
x.some_function()
x....
0
votes
0
answers
27
views
Assigning my custom class to an object/widget from a .ui file [duplicate]
Writing my 1st code in python, how can I create an instance of a class of my own and assign it to an object/widget from a .ui file?
Something like this:
import sys
from PyQt6.uic import loadUi
from ...
- 29
0
votes
2
answers
62
views
multiple inheritance without defining a class [duplicate]
I'm not sure that's possible, and I'm wondering if that's the way to go, or if there exists a better way of doing that.
I'll create a toy example to expose what I'm looking for.
Suppose I have people ...
- 354
2
votes
1
answer
48
views
How does __slots__ inheritance work? (My code works and I don't know why)
Here is the example of my implementation:
class FileHandler:
__slots__ = ("_target_path",)
def __init__(self, target_path: Path) -> None:
self._target_path = target_path
...
1
vote
3
answers
75
views
If I already have an instance of a super class, how can I create an instance of a child class from it?
How do I properly inherit data from an instantiation of a super class? For example, consider something I can get to work, but is confusing in its behaviour:
from dataclasses import dataclass
from ...
- 3,770
0
votes
2
answers
41
views
Pydantic Inheritance Defaults
How can I typehint a parent BaseModel such that a child subclass can provide defaults for some of the fields:
from pydantic import BaseModel
class Parent(BaseModel):
first: str
second: str
...
- 335
2
votes
1
answer
34
views
Python Django access fields from inherited model
Hi I have a question related to model inheritance and accessing the fields in a Django template.
My Model:
class Security(models.Model):
name = models.CharField(max_length=100, blank=False)
class ...
- 99
0
votes
1
answer
42
views
sql Alchemy models inheritance
I use Python and SQLAlchemy 2.0.23. My aim is to dynamically create SQLAlchemy models and tables in postgre database based on these models. I have several countries, and these are similar tables for ...
- 1
2
votes
2
answers
132
views
MyPy displays an error when inheriting from str and adding metaclass
Here's simple example of code:
class meta(type): pass
class Test(str, metaclass = meta): pass
When I run mypy on it (just from cli, without any flags or other additional setup) I'm seeing next output:...
- 143
0
votes
0
answers
20
views
Bug with diamon-shaped inheritance in Python [duplicate]
I am trying to use inheritance in which I have a base class, say X, and 2 classes which both independently inherit from X, say A(X) and B(x) (these represent the common attributes of a whole bunch of ...
1
vote
2
answers
34
views
How do I force instantiation of the child class and not the parent class?
I have two modules, one.py:
class A:
def __init__(self):
pass
class B:
def __init__(self):
pass
def assign_A(self):
self.A = A()
and two.py:
import one
class A(...
- 21
0
votes
2
answers
69
views
Can a nested python class inherit from its enclosing class
I have checked several questions that seem similar, but none fits my bill:
is it legal python to define the enclosing class as the super class of an inner class like this
class outer:
def say_hi():...
- 838
1
vote
1
answer
40
views
If Python builtins derive from ABCs, then why is their metaclass type instead of ABCMeta?
I was reading PEP-3119, and I discovered that builtins derive from ABCs.
From PEP-3119:
The built-in type set derives from MutableSet. The built-in type frozenset derives from Set and Hashable.
In ...
- 306
0
votes
1
answer
33
views
Functions inside inherited Cheetah template can't see global variables
I have some Cheetah templates that are structured using inheritance.
basepage.tmpl:
from quixote.publish import get_session()
#set global $session = get_session()
#block content
<!DOCTYPE html>...
- 7,623
1
vote
0
answers
57
views
Using the @override method in my package? Issues and workarounds?
In python, I am developing a package which has the following two classes:
I have a parent class:
class Parent:
def my_method(self):
return 1
and I have a child class that overrides this ...
- 181