BUG: regression for 1.3.0: saving a dataframe with the "pickle" package using pandas 1.2.5 would not open with "pickle" again with pandas 1.3.0 · Issue #42345 · pandas-dev/pandas (original) (raw)

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Code Sample, a copy-pastable example

I created a notebook here to illustrate the issue

https://colab.research.google.com/drive/1por9_BTeLYvZxNzLOBv_jIsFh44mnz4N?usp=sharing

Main error message:

/usr/local/lib/python3.7/dist-packages/pandas/_libs/internals.pyx in pandas._libs.internals.BlockManager.__cinit__()

TypeError: __cinit__() takes at least 2 positional arguments (0 given)

Problem description

Dataframes saved with pandas 1.2.5 and "pickle" are no longer loadable with pandas 1.3.0

Related to #42343

Expected Output

Output of pd.show_versions()

INSTALLED VERSIONS

commit : f00ed8f
python : 3.7.10.final.0
python-bits : 64
OS : Linux
OS-release : 5.4.104+
Version : #1 SMP Sat Jun 5 09:50:34 PDT 2021
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8

pandas : 1.3.0
numpy : 1.19.5
pytz : 2018.9
dateutil : 2.8.1
pip : 19.3.1
setuptools : 57.0.0
Cython : 0.29.23
pytest : 3.6.4
hypothesis : None
sphinx : 1.8.5
blosc : None
feather : 0.4.1
xlsxwriter : None
lxml.etree : 4.2.6
html5lib : 1.0.1
pymysql : None
psycopg2 : 2.7.6.1 (dt dec pq3 ext lo64)
jinja2 : 2.11.3
IPython : 5.5.0
pandas_datareader: 0.9.0
bs4 : 4.6.3
bottleneck : 1.3.2
fsspec : None
fastparquet : None
gcsfs : None
matplotlib : 3.2.2
numexpr : 2.7.3
odfpy : None
openpyxl : 2.5.9
pandas_gbq : 0.13.3
pyarrow : 3.0.0
pyxlsb : None
s3fs : None
scipy : 1.4.1
sqlalchemy : 1.4.18
tables : 3.4.4
tabulate : 0.8.9
xarray : 0.18.2
xlrd : 1.1.0
xlwt : 1.3.0
numba : 0.51.2