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CLN: Remove pickle support pre-pandas 1.0 #57155

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mroeschke
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For a major pandas 3.0 release, I think it's reasonable that pickle support for pre-pandas 1.0 can be removed by now.

@mroeschke mroeschke added the IO Pickle read_pickle, to_pickle label Jan 30, 2024
@mroeschke mroeschke added this to the 3.0 milestone Jan 30, 2024
self._sparse_index = sp_index
self._dtype = SparseDtype(sparse_values.dtype, fill_value)
else:
self.__dict__.update(state)
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Don't we still need this else branch? Or are we totally dropping support for this?

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I'm going to break up this PR. I cannot track where the failures are coming from.

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