Recursion error when combining abstract factory pattern with delegator pattern Question: I am learning about design patterns in Python and wanted to combine the abstract factory with the delegation pattern (to gain deeper insights into how the pattern works). However, I am getting a weird recursion error when combining the two patterns, which I do …
applying Singleton to Spotipy throws error Question: Spotipy’s object needs to be passed a credential kw arg my code: import spotipy class Spoti2(spotipy.Spotify): spoty_obj = None @classmethod def __new__(cls, client_credentials_manager): if cls.spoty_obj is None: cls.spoty_obj = super().__new__(cls) print(‘se creo instancia’) return cls.spoty_obj but i get the error: Spoti2.__new__() got multiple values for argument ‘client_credentials_manager’ however, …
Multiple calling @property that reduce list Question: I’m training my skills of design patterns. With a Factory schema i tried to get and pop example numbers from a imited list. With initialization of seccond account i recieved an IndexError. In debug mote i noticed that between initialisation of acc01 and acc02 I have a 4 …
Why use a superclass's __init__ to change it into a subclass? Question: I’m working on replicating the SHAP package algorithm – an explainability algorithm for machine learning. I’ve been reading through the author’s code, and I’ve come across a pattern I’ve never seen before. The author has created a superclass called Explainer, which is a …
Trying to understand the difference in what matches and the resulting output for findall vs finditer Question: Using findall: import re target_string = "please sir, that’s obviously a clip-on." result = re.findall(r"[a-z]+(‘[a-z])?[a-z]*", target_string) print(result) # result: [”, ”, "’s", ”, ”, ”, ”] Using finditer: import re target_string ="please sir, that’s obviously a clip-on." result …
Python Design Question – Concrete classes with different signature Question: I have two classes with similar methods; however, there are some different mandatory parameters in one class. e.g. class NamespaceScoped: def get_object(self, name, namespace): pass def delete_object(self, name, namespace): pass class ClusterScoped: def get_object(self, name): pass def delete_object(self, name): pass I need to create an …
python if list_item == re.match Question: I’m trying to practice regex patterns with conditions in python (googlecollab), but stuck in (if… and…) by getting proper numbers from the list[000 to 999] – i need only numbers, ending with one digit ‘1’ (not 11, 111, 211 – I need only 001, 021, 031, 101), but it …
How to have typing support for a static property (using a decorator) Question: Given a static property decorator: class static_property: def __init__(self, getter): self.__getter = getter def __get__(self, obj, objtype): return self.__getter(objtype) @staticmethod def __call__(getter_fn): return static_property(getter_fn) That is applied to a class as follows: class Foo: @static_prop def bar(self) -> int: return 10 Add …
What is the best principle to write files to a folder and delete them after a while within one script in Python? Question: I query the sql server and then write the result into a separated csv file in a folder every 10 secs. Then I want to delete those files which are older than …
Check unique value when define concrete class for abstract variable in python Question: Suppose that I have this architecture for my classes: # abstracts.py import abc class AbstractReader(metaclass=abc.ABCMeta): @classmethod def get_reader_name(cl): return cls._READER_NAME @classmethod @property @abc.abstractmethod def _READER_NAME(cls): raise NotImplementedError # concretes.py from .abstracts import AbstractReader class ReaderConcreteNumber1(AbstractReader): _READER_NAME = "NAME1" class ReaderConcreteNumber2(AbstractReader): _READER_NAME = …
