Tag: class

Type hint for instance of subclass

I want to allow type hinting using Python 3 to accept instances which are children of a given class. I’m using the enforce module to check the function typing. E.g.: but it seems like python 3 doesn’t allow for this syntax, returning: Argument ‘x’ was not of type < class ‘A’ >. Actual type was B. Any help? Answer By

Pyglet game movement lagging behind

class pyglet python

So, my snake makes a continuous movement, but if I press any key it goes back in time and lags back and forward. Here is a video: https://youtu.be/KCesu5bGiS8 My guess would be to update the key input faster, but when I do that everything updates faster, so the snake goes faster etc. Code (as requested in text form) here: Answer

Using the @property decorator for interrelated attributes within a Python class

class getter-setter properties python python-decorators

This question relates to using the @property decorator within a class in Python. I want to create a class with two public attributes (say a and b). I also want the class to have a further public attribute (say c) that is always equal to some calculation based on the other attributes within the class (say a + b =

How to cut my addiction to Python dictionaries

class dictionary memory-management namedtuple python

So, I have a large 30k line program I’ve been writing for a year. It basically gathers non-normalized and non-standardized data from multiple sources and matches everything up after standardizing the sources. I’ve written most everything with ordered dictionaries. This allowed me to keep the columns ordered, named and mutable, which made processing easier as values can be assigned/fixed throughout

Preferred way of resetting a class in Python

class python python-3.x

Based on this post on CodeReview. I have a class Foo in Python (3), which of course includes a __init__() method. This class fires a couple of prompts and does its thing. Say I want to be able to reset Foo so I can start the procedure all over again. What would be the preferred implementation? Calling the __init__() method

Namespaces inside class in Python3

class namespaces python python-3.x

I am new to Python and I wonder if there is any way to aggregate methods into ‘subspaces’. I mean something similar to this syntax: I am writing an API wrapper and I’m going to have a lot of very similar methods (only different URI) so I though it would be good to place them in a few subspaces that

Python Interactive Brokers ibapi

class python superclass

I am having trouble using and incrementing the “orderId” for each stock order using modified IB example code. I have a method that produces nextValidId within the class and prints it to stdout but I am not sure how to access the defined property (self.nextValidOrderId) that is created in my main() program body. I am able to instantiate the EWrapper

TypeError: generatecode() takes 0 positional arguments but 1 was given

arguments class python self tkinter

I have the code below: Then, I got the error below: TypeError: generatecode() takes 0 positional arguments but 1 was given So, how can I solve the error? Answer When you call a method on a class (such as generatecode() in this case), Python automatically passes self as the first argument to the function. So when you call self.my_func(), it’s

Change Python Class attribute dynamically

class django-admin python

I have a Class B inheriting Class A with a class attribute cls_attr. And I would like to set dynamically cls_attr in class B. Something like that: I tried several things. I know i might not be looking in the right place but i am out of solutions. EDIT: Classes are django admin classes Thanks. Answer class attributes can be