Description
I have some functions that deal with unions where one variant is the empty tuple. Per python/mypy#4211, the way to represent the empty tuple type is typing.Tuple[()]. Using this annotation crashes flake8-annotations-complexity with the following traceback:
Traceback (most recent call last):
File "/Users/maxchase/.pyenv/versions/structured-data/bin/flake8", line 10, in <module>
sys.exit(main())
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/cli.py", line 18, in main
app.run(argv)
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 393, in run
self._run(argv)
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 381, in _run
self.run_checks()
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 300, in run_checks
self.file_checker_manager.run()
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 331, in run
self.run_serial()
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 315, in run_serial
checker.run_checks()
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 598, in run_checks
self.run_ast_checks()
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 502, in run_ast_checks
for (line_number, offset, text, check) in runner:
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/checker.py", line 25, in run
self.max_annotations_complexity,
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 28, in validate_annotations_in_ast_node
complexity = get_annotation_compexity(annotation)
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 9, in get_annotation_compexity
return 1 + get_annotation_compexity(annotation_node.slice.value) # type: ignore
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in get_annotation_compexity
return max(get_annotation_compexity(n) for n in annotation_node.elts)
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in <genexpr>
return max(get_annotation_compexity(n) for n in annotation_node.elts)
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 9, in get_annotation_compexity
return 1 + get_annotation_compexity(annotation_node.slice.value) # type: ignore
File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in get_annotation_compexity
return max(get_annotation_compexity(n) for n in annotation_node.elts)
ValueError: max() arg is an empty sequence
I can put in a PR for this.