All Questions
23 questions
1vote
1answer
314views
Where to create repository instances?
I've several repositories. To make them testable, I add the ORM session in the constructor. class Repository: def __init__(session): self.session = session def save(object): self.session()...
CommunityBot
- 1
2votes
1answer
131views
A Design Pattern for a component which both writes to and reads from an ordered event log
I am searching for a good design for a set of components I am writing for a system. I believe it is very likely there is a Design Pattern, or set of Design Patterns, which could be combined to solve ...
- 320
-2votes
2answers
1kviews
Best practice: keep DB models in one file or split into modules?
I've a Python project with ~30 SQLAlchemy models and I'm not sure where they belong. All models belong to the DB but also to a module, so I'm not sure about the right namespace. Here are some ideas: ...
0votes
1answer
239views
How do we nest decorators?
It is possible to nest many decorators. @decorator_one @decorator_two @decorator_three @decorator_four def some_silly_function(): pass How do we write a decorator class so that the order in which ...
- 1,353
0votes
0answers
86views
Download method of type void vs response
Given a method that is widely used and has a void return type: from somepackage import download_model from somepackage import get_filename def download(name, download_path): response = ...
- 612
1vote
2answers
90views
Building a plugins-based code in Python
I have a program which perform different actions depending on the plugins that are passed. For example, python main.py -m foo -m bar will perform the actions of foo and bar. The structure of the ...
CommunityBot
- 1
0votes
1answer
207views
Passing messages through a chain of containers in python
When I write python code for simulations, I often end up with the following situation: I have a class describing the general environment which contains a list of instances of a class that describes ...
- 1,379
8votes
3answers
2kviews
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): ...
CommunityBot
- 1
9votes
3answers
6kviews
Better conditional debugging pattern?
Given the need to log only in debug mode the easiest way would be to use if conditions: def test(x, debug=False): if debug: print(x) # ...Some more code if debug: print("...
- 1,874
2votes
0answers
69views
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
0votes
1answer
63views
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,...
- 12.1k
0votes
1answer
71views
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 ...
- 2,973
1vote
2answers
157views
Critique on design principle and validity of such in general
I was hoping you could give some feedback on an idea I had for designing functions. I am trying to think of a unifying principle for choosing what functions should return. The specific project is ...
- 61.6k
8votes
2answers
4kviews
how to refactor many singletons
I have a medium-sized python program (~5000 lines of code), which I've built up over time, with no particular plan as I went ahead. The architecture I've ended up with consists of 5-6 large Singleton ...
- 6,420
1vote
2answers
143views
Efficient way to handle foreign keys
I am building a script that checks a large network of sites for invalid links. The idea is to flag links that continuously show as not available so that they can be cleaned by the administration team. ...
CommunityBot
- 1
