ListResult tree traversal bugfix

[MichaelBarnett]

Fixes an issue during tree traversal, where more than 3 tokens are returned from splitting some taxonstr, specifically when the name contains additional "[" and "]" brackets. For example in

• 668369 [strain] Escherichia coli DH5[alpha]
• 11022 [no rank] Eastern equine encephalitis virus (STRAIN VA33[TEN BROECK])

(When using the NCBI Taxonomy database)

The fix is as fast as, or faster than the original code splitting method (tested on 1,000,000 randomly generated sequences), with slightly faster outcomes on longer name strings.

steps to reproduce bug:

result = pytaxonkit.list([668369, 11022])
for taxon, tree in result:
    subtaxa = [t for t in tree.traverse]
    print(f'Top level result: {taxon.name} ({taxon.taxid}); {len(subtaxa)} related taxa')

results in exception:

Traceback (most recent call last):
  File "/root/repo/testing/pytaxonkit_fix.py", line 70, in <module>
    for taxon, tree in result:
                       ^^^^^^
  File "/root/miniconda3/envs/commec-dev/lib/python3.14/site-packages/pytaxonkit.py", line 141, in __iter__
    taxid, rank, name = taxonstr.replace("[", "]").split("]")
    ^^^^^^^^^^^^^^^^^
ValueError: too many values to unpack (expected 3, got 5)

[standage]

Thanks for reporting this! The s variable isn't defined here, I'm guessing you mean taxonstr?

[MichaelBarnett]

apologies, yes. That's what I get for not using consistent local var names when investigating a fix!

[standage]

The CI failures here have to do with conda, not with the code. So I'm going to go ahead and merge. Thanks!