All Questions
23 questions
1
vote
3
answers
988
views
Storing multiple instances on a Singleton?
RefactoringGuru's example Singleton in Python has an _instances dictionary field
class Singleton(type):
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls....
- 145
0
votes
1
answer
527
views
Python: Function pipeline with multiple return/input values, or use OOP? Best Practices?
I have a 'processing' function and a 'serializing' function. Currently the processor returns 4 different types of data structures to be serialized in different ways.
Looking for the best practise on ...
- 17
-1
votes
1
answer
210
views
Refactoring: Pythonic way of reducing the subclasses?
background: so, I am working on an NLP problem. where I need to extract different types of features based on different types of context from text documents. and I currently have a setup where there is ...
- 109
2
votes
1
answer
507
views
Converter implementation in Python: class versus module?
I've written a little library that uses the builtin ast library to convert between functions, docstrings, argparse .add_argument, classes, and [soon] more.
Stubs look something like this, with ir ...
- 131
4
votes
2
answers
4k
views
What's wrong with using a Singleton?
I'm working on a Python application in which there are two Singleton classes: App and Configuration.
The former seems straight forward, only ever instantiate one App instance; the latter seems ...
- 1,047
1
vote
4
answers
884
views
Design pattern for a function class
I have been experimenting with the idea of function classes as explained in this article and Composition applied to function dependencies as described in the following questions:
https://stackoverflow....
- 267
-3
votes
2
answers
141
views
Seeking appropriate design pattern(s) to describe most function-based mathematical problems
I have been looking for a good, general design pattern to implement simple mathematical structures where functions have the following properties:
know which parameters they contain, parameters are "...
- 267
4
votes
2
answers
344
views
Does my class violate the Single Responsibility Principle in SOLID?
I want to ask:
Whether the Role class violates Single Responsibility Principle in SOLID ? I think deleteAccount() is not belong to Role class but Role class is way to extend code in the future
There ...
0
votes
2
answers
87
views
How to design classes of a self-driving machine, if I need a simulation?
Background: I'm working on a project with a self-driving machine with a tank-like control, somehting like:
forward()
left()
right()
stop()
The code is running on a raspberry pi. The GPIO outputs are ...
- 11
7
votes
2
answers
12k
views
Design pattern for similar classes that require different implementations
Edited: Update is at the bottom
There could be a common or best practice for this scenario, but I am unfamiliar with it. However, it could very easily be a matter of subjective opinion on how one ...
- 1,047
2
votes
0
answers
69
views
How to interface with very badly written code in Python? [duplicate]
I have to extend some very badly written Python code (no documentation, very interdependent, barely any encapsulation, very static, everything hard-coded, etc..) and therefore do I obviously have to ...
- 29
0
votes
1
answer
63
views
Method grouping other methods of the same family and how to call any of these separately
Worse title ever but I don't really know how to describe my scenario in a line...
So I have a method that wraps the calls of a many methods of the same nature. Once any of these methods have finished,...
- 2,266
0
votes
1
answer
71
views
Redesign factory to throw error on load time instead of on execution time
I am using a factory pattern to get objects that shouldn't be instantiated other than the factory class. These objects are of type ViolationType, which represent violations on a set of rule. Here is ...
- 2,266
1
vote
2
answers
12k
views
Is it good practice to store instances within a class variable in Python?
I've come across two Stack Overflow posts that seem to offer conflicting answers:
https://stackoverflow.com/questions/4831307/is-it-bad-to-store-all-instances-of-a-class-in-a-class-field
https://...
- 127
8
votes
3
answers
2k
views
Refactoring of a client API for avoid duplicated code and unclear passage of parameters
I need to develop an API, the functions of the API are requests that call the service exposed by a server.
Initially the API worked like this:
class Server:
def firstRequest(self, arg1, arg2):
...
- 227