Method _check_copy_deprecation

pandas/core/generic.py:4421–4430

(copy)

    @staticmethod
    def _check_copy_deprecation(copy):
        if copy is not lib.no_default:
            warnings.warn(
                "The copy keyword is deprecated and will be removed in a future "
                "version. Copy-on-Write is active in pandas since 3.0 which utilizes "
                "a lazy copy mechanism that defers copies until necessary. Use "
                ".copy() to make an eager copy if necessary.",
                Pandas4Warning,
                stacklevel=find_stack_level(),
            )

    # issue 58667
    @deprecate_kwarg(Pandas4Warning, "method", new_arg_name=None)