pylint crashes with error "AttributeError: 'str' object has no attribute '_infer_name'" #3306
Description
The shortest code I can get to trigger this bug:
_CUSTOM_SCRIPTS = {'echo': lambda x: x} def _generate_message(message): if isinstance(message, list): _, *args = message function_name, *args = args return _CUSTOM_SCRIPTS[function_name](*args) if isinstance(message, str): return message raise TypeError if __name__ == '__main__': assert _generate_message(['function', 'echo', 'test']) == 'test' assert _generate_message('test') == 'test'Steps to reproduce
- Save the code above in
test.py pylint test.py
Current behavior
Traceback (most recent call last): File "/usr/local/bin/pylint", line 10, in <module> sys.exit(run_pylint()) File "/usr/local/lib/python3.7/site-packages/pylint/__init__.py", line 23, in run_pylint PylintRun(sys.argv[1:]) File "/usr/local/lib/python3.7/site-packages/pylint/lint.py", line 1731, in __init__ linter.check(args) File "/usr/local/lib/python3.7/site-packages/pylint/lint.py", line 1004, in check self._do_check(files_or_modules) File "/usr/local/lib/python3.7/site-packages/pylint/lint.py", line 1165, in _do_check self.check_astroid_module(ast_node, walker, rawcheckers, tokencheckers) File "/usr/local/lib/python3.7/site-packages/pylint/lint.py", line 1252, in check_astroid_module walker.walk(ast_node) File "/usr/local/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 77, in walk self.walk(child) File "/usr/local/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 77, in walk self.walk(child) File "/usr/local/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 77, in walk self.walk(child) File "/usr/local/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 74, in walk callback(astroid) File "/usr/local/lib/python3.7/site-packages/pylint/checkers/base.py", line 2273, in visit_compare self._check_callable_comparison(node) File "/usr/local/lib/python3.7/site-packages/pylint/checkers/base.py", line 2257, in _check_callable_comparison for operand in (left_operand, right_operand) File "/usr/local/lib/python3.7/site-packages/pylint/checkers/base.py", line 2258, in <genexpr> if isinstance(utils.safe_infer(operand), bare_callables) File "/usr/local/lib/python3.7/site-packages/pylint/checkers/utils.py", line 1084, in safe_infer value = next(inferit) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 95, in wrapped res = next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/inference.py", line 227, in infer_call yield from callee.infer_call_result(caller=self, context=callcontext) File "/usr/local/lib/python3.7/site-packages/astroid/scoped_nodes.py", line 1677, in infer_call_result yield from returnnode.value.infer(context) File "/usr/local/lib/python3.7/site-packages/astroid/util.py", line 160, in limit_inference yield from islice(iterator, size) File "/usr/local/lib/python3.7/site-packages/astroid/context.py", line 113, in cache_generator for result in generator: File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 95, in wrapped res = next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/inference.py", line 221, in infer_call for callee in self.func.infer(context): File "/usr/local/lib/python3.7/site-packages/astroid/util.py", line 160, in limit_inference yield from islice(iterator, size) File "/usr/local/lib/python3.7/site-packages/astroid/context.py", line 113, in cache_generator for result in generator: File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 95, in wrapped res = next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/inference.py", line 362, in infer_subscript for index in self.slice.infer(context): File "/usr/local/lib/python3.7/site-packages/astroid/util.py", line 160, in limit_inference yield from islice(iterator, size) File "/usr/local/lib/python3.7/site-packages/astroid/context.py", line 113, in cache_generator for result in generator: File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/util.py", line 160, in limit_inference yield from islice(iterator, size) File "/usr/local/lib/python3.7/site-packages/astroid/context.py", line 113, in cache_generator for result in generator: File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 95, in wrapped res = next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/bases.py", line 133, in _infer_stmts for inferred in stmt.infer(context=context): File "/usr/local/lib/python3.7/site-packages/astroid/util.py", line 160, in limit_inference yield from islice(iterator, size) File "/usr/local/lib/python3.7/site-packages/astroid/context.py", line 113, in cache_generator for result in generator: File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 131, in raise_if_nothing_inferred yield next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/decorators.py", line 95, in wrapped res = next(generator) File "/usr/local/lib/python3.7/site-packages/astroid/bases.py", line 131, in _infer_stmts context.lookupname = stmt._infer_name(frame, name) AttributeError: 'str' object has no attribute '_infer_name' Expected behavior
Exit without error.
pylint --version output
pylint 2.4.4
astroid 2.3.3
Python 3.7.3 (default, Mar 27 2019, 09:23:15)
[Clang 10.0.1 (clang-1001.0.46.3)]