Prototype Python example error
Here is the quote from the third and fourth lines of the output.txt:
Adding elements to `deep_copied_component`'s some_list_of_objects adds it to `component`'s some_list_of_objects. Changing objects in the `component`'s some_list_of_objects changes that object in `deep_copied_component`'s some_list_of_objects.
Simply put, it says that adding elements to deep-copied objects affects the original objects and vice versa. However, this sounds buggy, as far as I understand, deep-copied objects and the original objects are independent.
A Possible Solution
1. change "new.__dict__.update(self.__dict__)" (line 67, in SomeComponent.__deepcopy__)
to "new.__dict__ = copy.deepcopy(self.__dict__, memo)"
reson: the origianl code may overwirte the deep-copyed filed some_list_of_objects.
2. change "another object" (line 116 and 117)
to "another object2"
reason: element "another object" has been added when testing shallow_copied_component.
After these two modifications, the output looks more reasonable (to me)
Adding elements to `deep_copied_component`'s some_list_of_objects doesn't add it to `component`'s some_list_of_objects.
Changing objects in the `component`'s some_list_of_objects doesn't change that object in `deep_copied_component`'s some_list_of_objects.
However, I am new to python and all of these may be nonsense. If this is the case, would anyone be kind enough to tell me why :)
Customer support service by UserEcho
Here is the link to the example code: https://refactoring.guru/design-patterns/prototype/python/example#example-0--Output-txt
Thank you! Would you be so kind as to make a pull request with a fix to this repository? https://github.com/RefactoringGuru/design-patterns-python