Why Can\'t I Monkey Patch Python\'s Core Data Types?

Can't Patch, Monkey?

In contrast to Ruby, Python restricts method patching on core types like the Number class. This inability stems from the immutability of data defined in C extension modules, which encompasses Python's builtins.

The underlying reason lies in the sharing of C modules between interpreters within the same process. If monkeypatching were permitted, alterations to these modules would propagate to all interpreters, causing unintended consequences.

The restriction extends beyond methods to all data defined in C modules, making it impossible to add or modify attributes, for instance.

By contrast, classes created in Python code can be monkeypatched because they are confined to the specific interpreter. This distinction highlights the immunity of core Python types to changes originating from user code.

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