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OOP & classes

Classes, instances, methods, dataclasses, and object-oriented design in Python.

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OOP & classes easy

How to Copy Class Instances in Python: Shallow vs Deep Copy

Use copy.copy and copy.deepcopy to clone class instances, showing how nested objects are shared or duplicated.

copy deepcopy shallow copy
Python 
import copy


class Config:
    def __init__(self):
        self.settings = {"theme": "dark", "language": "en"}


if __name__ == "__main__":
    original = Config()

    shallow_copy = copy.copy(original)
    deep_copy = copy.deepcopy(original)

    shallow_copy.settings["theme"] = "light"
    deep_copy.settings["them…
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