def nits(self):
    with_contexts = set(self.iter_ast_types(ast.With))
    with_context_calls = set(node.context_expr for node in with_contexts
        if isinstance(node.context_expr, ast.Call))

    for call in self.iter_ast_types(ast.Call):
      if isinstance(call.func, ast.Name) and call.func.id == 'open' \
        and (call not in with_context_calls):

        yield self.warning('T802', 'open() calls should be made within a contextmanager.', call)
dataset/ETHPy150Open pantsbuild/pants/contrib/python/src/python/pants/contrib/python/checks/tasks/checkstyle/missing_contextmanager.py/MissingContextManager.nits/original