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…
Tag: class
Pyglet game movement lagging behind
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 tex…
Using the @property decorator for interrelated attributes within a Python class
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 + …
How to cut my addiction to Python dictionaries
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 colum…
Preferred way of resetting a class in Python
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 __i…
Namespaces inside class in Python3
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 subspac…
python: class vs tuple huge memory overhead (?)
I’m storing a lot of complex data in tuples/lists, but would prefer to use small wrapper classes to make the data structures easier to understand, e.g. would be preferable over however there seems to be a horrible memory overhead: and Why? is there any obvious alternative solution that I didn’t th…
Python Interactive Brokers ibapi
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()…
TypeError: generatecode() takes 0 positional arguments but 1 was given
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 w…
Change Python Class attribute dynamically
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 att…