ak.ArrayBuilder.show passes Formatter to ak.Array.show, causing TypeError #3724
Description
Version of Awkward Array
2.8.10
Description and code to reproduce
The ak.ArrayBuilder.show docs state that the method “takes a snapshot of the data and calls show on it, so the arguments should be forwarded unchanged. The ak.Array.show docs specify that formatter must be a mapping or None. In the current implementation, ArrayBuilder.show wraps the caller’s formatter into a Formatter object before delegating to snapshot().show, so Array.show receives a Formatter instance and attempts to subscript it, triggering TypeError.
import awkward as ak
builder = ak.ArrayBuilder()
builder.begin_list()
builder.real(1.2)
builder.end_list()
builder.show(stream=None)Traceback (most recent call last):
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 291, in __call__
impl = self._cache[type(obj)]
~~~~~~~~~~~^^^^^^^^^^^
KeyError: <class 'numpy.float64'>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/data/src/test.py", line 8, in <module>
builder.show(stream=None)
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/highlevel.py", line 2878, in show
return self.snapshot().show(
^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/highlevel.py", line 1441, in show
rows = highlevel_array_show_rows(
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 482, in highlevel_array_show_rows
array_line = valuestr(array, limit_rows, limit_cols, formatter=formatter_impl)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 378, in valuestr
_, strs = valuestr_horiz(get_at(data, index), limit_cols - 2, formatter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 166, in valuestr_horiz
cols_taken, strs = valuestr_horiz(get_at(data, 0), limit_cols, formatter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 279, in valuestr_horiz
out = formatter(data)
^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 293, in __call__
impl = self._find_formatter_impl(type(obj))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hdd/miniconda3/envs/py312/lib/python3.12/site-packages/awkward/prettyprint.py", line 316, in _find_formatter_impl
return self._formatters["float"]
~~~~~~~~~~~~~~~~^^^^^^^^^
TypeError: 'Formatter' object is not subscriptable
builder.show(stream=None) should succeed and match builder.snapshot().show(stream=None).
Note: This issue was identified by an automated testing tool for academic research and manually verified. If you have any concerns about this type of reporting, please let me know, and I will adjust my workflow accordingly.