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REGR: Fix reading old pickles from pandas 1.3.5 #56308

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merged 4 commits into from
Dec 5, 2023
Merged

REGR: Fix reading old pickles from pandas 1.3.5 #56308

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REGR: Fix reading old pickles from pandas 1.3.5
lithomas1 Dec 3, 2023
9df6e14
Merge branch 'main' of github.com:pandas-dev/pandas into fix-read-old…
lithomas1 Dec 4, 2023
1b2f1c3
Use pickle compat
lithomas1 Dec 4, 2023
6666d0b
extraneous space
lithomas1 Dec 4, 2023
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.1.4.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ including other versions of pandas.

Fixed regressions
~~~~~~~~~~~~~~~~~
-
- Fixed regression when trying to read a pickled pandas :class:`DataFrame` from pandas 1.3 (:issue:`55137`)
-

.. ---------------------------------------------------------------------------
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6 changes: 6 additions & 0 deletions pandas/compat/pickle_compat.py
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Expand Up @@ -65,6 +65,12 @@ def load_reduce(self) -> None:
("pandas.core.sparse.array", "SparseArray"): ("pandas.core.arrays", "SparseArray"),
# 15477
("pandas.core.base", "FrozenNDArray"): ("numpy", "ndarray"),
# Re-routing unpickle block logic to go through _unpickle_block instead
# for pandas <= 1.3.5
("pandas.core.internals.blocks", "new_block"): (
"pandas._libs.internals",
"_unpickle_block",
),
("pandas.core.indexes.frozen", "FrozenNDArray"): ("numpy", "ndarray"),
("pandas.core.base", "FrozenList"): ("pandas.core.indexes.frozen", "FrozenList"),
# 10890
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Binary file added pandas/tests/io/data/legacy_pickle/1.3.5/1.3.5_x86_64_darwin_3.10.13.pickle
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9 changes: 8 additions & 1 deletion pandas/tests/io/generate_legacy_storage_files.py
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Expand Up @@ -38,6 +38,10 @@
import platform as pl
import sys

# Remove script directory from path, otherwise Python will try to
# import the JSON test directory as the json module
sys.path.pop(0)

import numpy as np

import pandas
Expand Down Expand Up @@ -314,7 +318,7 @@ def write_legacy_pickles(output_dir):

def write_legacy_file():
# force our cwd to be the first searched
sys.path.insert(0, ".")
sys.path.insert(0, "")

if not 3 <= len(sys.argv) <= 4:
sys.exit(
Expand All @@ -325,6 +329,9 @@ def write_legacy_file():
output_dir = str(sys.argv[1])
storage_type = str(sys.argv[2])

if not os.path.exists(output_dir):
os.mkdir(output_dir)

if storage_type == "pickle":
write_legacy_pickles(output_dir=output_dir)
else:
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