[ARROW-14766] [Python] compute function arguments cannot be passed by name, despite the exposed signature

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/30301
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 18/Nov/21 13:28
• Updated: 11/Jan/23 08:42
• Resolved: 15/Dec/21 12:30

Description

Example:

>>> pc.is_in_meta_binary?
Signature: pc.is_in_meta_binary(values, value_set, *, memory_pool=None)
Docstring:
Find each element in a set of values.

For each element in `values`, return true if it is found in `value_set`,
false otherwise.

Parameters
----------
values : Array-like or scalar-like
    Argument to compute function
value_set : Array-like or scalar-like
    Argument to compute function
memory_pool : pyarrow.MemoryPool, optional
    If not passed, will allocate memory from the default memory pool.
File:      ~/arrow/dev/python/pyarrow/compute.py
Type:      function

>>> pc.is_in_meta_binary(["a", "b", "c"], ["a", "b"])
<pyarrow.lib.BooleanArray object at 0x7f63c5dfad00>
[
  true,
  true,
  false
]
>>> pc.is_in_meta_binary(["a", "b", "c"], value_set=["a", "b"])
Traceback (most recent call last):
  File "<ipython-input-5-ea763d55e2a9>", line 1, in <module>
    pc.is_in_meta_binary(["a", "b", "c"], value_set=["a", "b"])
TypeError: wrapper() got an unexpected keyword argument 'value_set'

Two possible solutions:

• mark the argument positional-only
• (better) change the generated wrapper to accept said named arguments

Issue Links

• links to: GitHub Pull Request #11951