Re: [I] [Python] Subclassing the PyExtensionType and getting it's bit_width attribute returns Non-fixed width type ValueError [arrow]

Tue, 12 May 2026 00:24:50 -0700 


AlenkaF commented on issue #32284:
URL: https://github.com/apache/arrow/issues/32284#issuecomment-4428246325

   Unfortunately this is a very old issue that can be closed.
   `PyExtensionType` class has been removed in 
https://github.com/apache/arrow/issues/46198.
   
   A working example with the `ExtensionType` is as follows:
   
   ```python
   In [1]: import pyarrow as pa
   
   In [2]: class ExampleUuidType(pa.ExtensionType):
      ...: 
      ...:     def __init__(self):
      ...:         super().__init__(pa.binary(16), 
'pyarrow.tests.ExampleUuidType')
      ...: 
      ...:     def __reduce__(self):
      ...:         return ExampleUuidType, ()
      ...: 
      ...:     def __arrow_ext_serialize__(self):
      ...:         return b''
      ...: 
      ...:     @classmethod
      ...:     def __arrow_ext_deserialize__(cls, storage_type, serialized):
      ...:         return cls()
      ...: 
   
   In [3]: ty = ExampleUuidType()
   
   In [4]: ty.bit_width
   Out[4]: 128
   ```


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