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Backport PR #56308 on branch 2.1.x (REGR: Fix reading old pickles from pandas 1.3.5) #56335

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Merged
merged 1 commit into from
Dec 5, 2023
Merged

Backport PR #56308 on branch 2.1.x (REGR: Fix reading old pickles from pandas 1.3.5) #56335

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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):
("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 @@ -320,7 +324,7 @@ 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 @@ -331,6 +335,9 @@ 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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