FYI: I am using Python v3.11.5 on Windows 11 Hi, I am currently getting familiarized with class attributes vs. instance attributes. The following is a test class to test the difference. My expected output based on the terminal commands, is: Expected Output Actual Output ibm ucd teste…

Could you please fix the preformatted text to include all your code? It is hard to see without the correct indenting.

Hi, that is all of the code: class Person: company = 'ucd' # Class attribute def __init__(self): self.age = 23 # Instance attribute The expected output is: ibm tester tester Instead, I am getting the following: ucd ibm tester

[image] Paul: From python theory, class attributes affect all subsequent instances. What do you mean by “all subsequent instances”?

By instances, I mean as in: p1 = Person() p2 = Person() . . . pn = Person() Since it is a ‘class’ attribute, it should be the same for all instances (at least according to theory). So, if I gave the following command: p1.company = ‘change variable result’ # As an example of course then, …

p1.company = "abc" creates (or resets) a new instance attribute for p1. This is not identical to Person.company. Person.company = "xyz" changes the company attribute of all new (and old) Person instances: >>> class P: ... comp = "abc" >>> p = P() >>> p.comp 'abc' >>> P.comp = "xyz" >>> p.com…

Hi, thank you for your response. This makes a lot of sense as the change is being directed from the class itself. I was actually basing my proposition from the attached tutorial which I found during a search on composition. Notice how it states: Change to class attribute ‘company’ affects all…

Yes, so the information in the last block is misleading/incorrect since p1.company = "ibm" does not in any way impact the class attribute Person.company. There is a glut of tutorials currently - I don’t think all of them are particularly good…

In that case, the tutorial has two ‘typos’. A ‘screenshot’ of the test run results and the instructions stating the expected results. In any case, since you’re here, I want to learn more on composition via examples since I am prepping myself for the tkinter module for GUI creation. From my init…

Yeah, unfortunately that tutorial seems to have written it wrongly. It would be correct if it said it like this: >>> p1 = Person() >>> p2 = Person() >>> Person.company = "IBM" >>> p2.company 'IBM' Though I’ve made the same blunder that the tutorial author presumably did, and typed this out directl…

[image] Paul: the tkinter module for GUI creation. From my initial research on the subject matter, this module is inheritance/composition heavy. Do you have any recommendations? I don’t really have experience with tinter - apart from knowing it exists (and I believe IDLE was written using it…

Class Variable Acting Like An Instance Attribute

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Rosuav (Chris Angelico) October 6, 2023, 9:22pm 4

What do you mean by “all subsequent instances”?