[jira] [Created] (ARROW-14501) [Python] Add StructType attribute to access all its fields

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-14501:
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             Summary: [Python] Add StructType attribute to access all its fields
                 Key: ARROW-14501
                 URL: https://issues.apache.org/jira/browse/ARROW-14501
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Joris Van den Bossche


Currently when having a StructType, you can check the number of fields or get a specific field by index:

{code}
>>> struct_type = pa.struct([('a', pa.int64()), ('b', pa.float64())])
>>> struct_type.num_fields
2
>>> struct_type.get_field_index("a")
0
>>> struct_type[0]
pyarrow.Field<a: int64>
{code}

and so that means you can actually get all fields by iterating:

{code}
>>> list(struct_type)
[pyarrow.Field<a: int64>, pyarrow.Field<b: double>]
{code}

That's straightfoward code once you know this, but personally I don't find this very discoverable. 

I think it would be nice to have some additional convenience attributes, such as {{.fields}} returning a list of all fields and {{.names}} returning a list of the field names (currently you need {{[f.name for f in struct_type]}} for this).



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