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BUG/DOC: Update dtype_backend documentation and API #55692

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BUG/DOC: Update dtype_backend documentation and API #55692

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10 changes: 7 additions & 3 deletions pandas/io/parsers/readers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -436,14 +436,15 @@

.. versionadded:: 1.2

dtype_backend : {{'numpy_nullable', 'pyarrow'}}, default 'numpy_nullable'
dtype_backend : {{'numpy_nullable', 'pyarrow', 'numpy'}}, default 'numpy'
Back-end data type applied to the resultant :class:`DataFrame`
(still experimental). Behaviour is as follows:

* ``"numpy_nullable"``: returns nullable-dtype-backed :class:`DataFrame`
(default).
* ``"numpy_nullable"``: returns nullable-dtype-backed :class:`DataFrame`.
* ``"pyarrow"``: returns pyarrow-backed nullable :class:`ArrowDtype`
DataFrame.
* ``"numpy"``: returns numpy-backed :class:`DataFrame`
(default).

.. versionadded:: 2.0

Expand Down Expand Up @@ -2127,6 +2128,9 @@ def _refine_defaults_read(
else:
raise ValueError(f"Argument {on_bad_lines} is invalid for on_bad_lines")

if dtype_backend == "numpy":
dtype_backend = lib.no_default

check_dtype_backend(dtype_backend)

kwds["dtype_backend"] = dtype_backend
Expand Down