singleton

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, …

How to implement same customized log through differents files via logging module Question: I believe from other questions I have read that logging has a singleton pattern but I did not succeed to implement it right. I have a logger.py file like this : import logging import os from concurrent_log_handler import ConcurrentRotatingFileHandler def create_file_handler(path, filename=None): …

Why is this singleton implementation "not thread safe"? Question: 1. The @Singleton decorator I found an elegant way to decorate a Python class to make it a singleton. The class can only produce one object. Each Instance() call returns the same object: class Singleton: “”” A non-thread-safe helper class to ease implementing singletons. This should …

How can I memoize a class instantiation in Python? Question: Ok, here is the real world scenario: I’m writing an application, and I have a class that represents a certain type of files (in my case this is photographs but that detail is irrelevant to the problem). Each instance of the Photograph class should be …

Creating a singleton in Python Question: This question is not for the discussion of whether or not the singleton design pattern is desirable, is an anti-pattern, or for any religious wars, but to discuss how this pattern is best implemented in Python in such a way that is most pythonic. In this instance I define …

How to create module-wide variables in Python? Question: Is there a way to set up a global variable inside of a module? When I tried to do it the most obvious way as appears below, the Python interpreter said the variable __DBNAME__ did not exist. … __DBNAME__ = None def initDB(name): if not __DBNAME__: __DBNAME__ …

@staticmethod with @property Question: I want Stats.singleton.twitter_count += 1 and I thought I could do class Stats: singleton_object = None @property @staticmethod def singleton(): if Stats.singleton_object: return Stats.singleton_object Stats.singleton_object = Stats() return Stats.singleton() But it throws an exception: >>> Stats.singleton.a = “b” Traceback (most recent call last): File “<stdin>”, line 1, in <module> TypeError: ‘property’ …

Why is the Borg pattern better than the Singleton pattern in Python Question: Why is the Borg pattern better than the Singleton pattern? I ask because I don’t see them resulting in anything different. Borg: class Borg: __shared_state = {} # init internal state variables here __register = {} def __init__(self): self.__dict__ = self.__shared_state if …

Is there a simple, elegant way to define singletons? Question: There seem to be many ways to define singletons in Python. Is there a consensus opinion on Stack Overflow? Asked By: Jamie || Source Answers: Being relatively new to Python I’m not sure what the most common idiom is, but the simplest thing I can think …