Re: [I] [Python] Allow creating extension arrays via `pa.array` constructor [arrow]

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

khwilson commented on issue #44406:
URL: https://github.com/apache/arrow/issues/44406#issuecomment-2412650636

   I believe this already works. See https://github.com/apache/arrow/blob/main/python/pyarrow/array.pxi#L372 and this example:
   
   ```python
   from uuid import uuid4
   
   import pyarrow as pa
   
   class UuidType(pa.ExtensionType):
   
      def __init__(self):
         pa.ExtensionType.__init__(self, pa.binary(16), "my_package.uuid")
   
      def __arrow_ext_serialize__(self):
         # since we don't have a parameterized type, we don't need extra
         # metadata to be deserialized
         return b''
   
      @classmethod
      def __arrow_ext_deserialize__(self, storage_type, serialized):
         # return an instance of this subclass given the serialized
         # metadata.
         return UuidType()
   
   def main():
       data = [uuid4().bytes]
       arr = pa.array(data, type=UuidType())
       print(arr)
   
   if __name__ == "__main__":
       main()
   ```


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