Hello, I am not sure it is a bug, but it is a very strange behavior of Python, which I do not understand.

I created a class (mainly a structure) and instantiated an object of this class in a first function (Object 1). The function populates Object 1.
In another function, I instantiate another object of the same class (Object 2) , and Object 2 is automatically populated with the data of Object 1. Note than Object 1 and Object 2 have different memory adresses.

This behavior is very strange. Is it normal for Python or is it a Bug ?

It's impossible to guess exactly what you did from your vague description instead of actual code, but it may be covered by this FAQ question: https://docs.python.org/3/faq/programming.html#why-are-default-values-shared-between-objects

(mutable objects as class rather than instance attributes will display similar behavior. This isn't a bug.)

Hi Geoffrey,

Indeed you where right, this is not a bug.
The link you provided did solve my problem.
I declared classes with attributes as strings, lists, etc... and indeed it was the reason for the issue.
I changed it to instantiate the attributes in the __init__ method of the class, and it solved the problems.
Thanks again !!