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API/DOC: an ExtensionDtype.__from_arrow__ method to convert pyarrow.Array into ExtensionArray #29229

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Nov 8, 2019
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API/DOC: an ExtensionDtype.__from_arrow__ method to convert pyarrow.Array into ExtensionArray #29229

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API/DOC: an ExtensionDtype.__from_arrow__ method to convert pyarrow.A…
jorisvandenbossche Oct 25, 2019
be33414
add signature
jorisvandenbossche Oct 29, 2019
9ddfb20
add chunked array as option
jorisvandenbossche Nov 8, 2019
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12 changes: 12 additions & 0 deletions pandas/core/dtypes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,18 @@ class property**.
Added ``_metadata``, ``__hash__``, and changed the default definition
of ``__eq__``.

For interaction with Apache Arrow (pyarrow), a ``__from_arrow__`` method
can be implemented: this method receives a pyarrow Array or ChunkedArray
as only argument and is expected to return the appropriate pandas
ExtensionArray for this dtype and the passed values::

class ExtensionDtype:

def __from_arrow__(
self, array: pyarrow.Array/ChunkedArray
) -> ExtensionArray:
...

This class does not inherit from 'abc.ABCMeta' for performance reasons.
Methods and properties required by the interface raise
``pandas.errors.AbstractMethodError`` and no ``register`` method is
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