pd.read_hdf throws 'cannot set WRITABLE flag to True of this array' pd.read_hdf throws 'cannot set WRITABLE flag to True of this array' python python

pd.read_hdf throws 'cannot set WRITABLE flag to True of this array'


python pandas pytables hdf

Are you using numpy 1.16? It is incompatible with the latest release of pytables (see https://github.com/PyTables/PyTables/blob/v3.4.4/tables/hdf5extension.pyx#L2155) but the pytables team have not yet released a fixed version: https://github.com/PyTables/PyTables/issues/719

The only way I found to fix this is to downgrade numpy.

python pandas pytables hdf

Upgrading PyTables to version > 3.5.1 should solve this.

pip install --upgrade tables

python pandas pytables hdf

It seems that time-date strings were causing the problem and when I converted these from text to numpy (pd.to_datetime()) and stored the table and the problem went away so perhaps it has something to do with text data?

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