[GitHub] [arrow] NMAC427 commented on issue #36277: [Python] Can't convert datetime.date to pa.timestamp in pa.array

["NMAC427 (via GitHub)" <gi...@apache.org>]

NMAC427 commented on issue #36277:
URL: https://github.com/apache/arrow/issues/36277#issuecomment-1606992527

   This can also be replicated with pandas:
   
   ```python
   pd.Series([dt.date(1970, 1, 1)], dtype=pd.ArrowDtype(pa.timestamp("ms")))
   
   ---------------------------------------------------------------------------
   ArrowTypeError                            Traceback (most recent call last)
   Cell In[14], line 1
   ----> 1 pd.Series([dt.date(1970, 1, 1)], dtype=pd.ArrowDtype(pa.timestamp("ms")))
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pandas/core/series.py:509, in Series.__init__(self, data, index, dtype, name, copy, fastpath)
       507         data = data.copy()
       508 else:
   --> 509     data = sanitize_array(data, index, dtype, copy)
       511     manager = get_option("mode.data_manager")
       512     if manager == "block":
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pandas/core/construction.py:559, in sanitize_array(data, index, dtype, copy, allow_2d)
       557     _sanitize_non_ordered(data)
       558     cls = dtype.construct_array_type()
   --> 559     subarr = cls._from_sequence(data, dtype=dtype, copy=copy)
       561 # GH#846
       562 elif isinstance(data, np.ndarray):
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pandas/core/arrays/arrow/array.py:270, in ArrowExtensionArray._from_sequence(cls, scalars, dtype, copy)
       268     scalars = deepcopy(scalars)
       269 try:
   --> 270     scalars = pa.array(scalars, type=pa_dtype, from_pandas=True)
       271 except pa.ArrowInvalid:
       272     # GH50430: let pyarrow infer type, then cast
       273     scalars = pa.array(scalars, from_pandas=True)
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pyarrow/array.pxi:327, in pyarrow.lib.array()
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pyarrow/array.pxi:39, in pyarrow.lib._sequence_to_array()
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pyarrow/error.pxi:144, in pyarrow.lib.pyarrow_internal_check_status()
   
   File ~/Library/Caches/pypoetry/virtualenvs/pydiverse-pipedag-JBY4b-V4-py3.11/lib/python3.11/site-packages/pyarrow/error.pxi:123, in pyarrow.lib.check_status()
   
   ArrowTypeError: object of type <class 'datetime.date'> cannot be converted to int
   ```
   
   However, initializing the Series as a `date32` and then casting to `timestamp` works:
   
   ```python
   pd.Series([dt.date(1970, 1, 1)], dtype=pd.ArrowDtype(pa.date32())).astype(pd.ArrowDtype(pa.timestamp("ms")))
   ```


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