--------------------------------------------------------------------------- KeyError Traceback (most recent call last) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/scope.py:236, in Scope.resolve(self, key, is_local) 235 assert not is_local and not self.has_resolvers --> 236 return self.scope[key] 237 except KeyError: File ~/miniconda3/envs/modin-dev/lib/python3.9/collections/__init__.py:941, in ChainMap.__getitem__(self, key) 940 pass --> 941 return self.__missing__(key) File ~/miniconda3/envs/modin-dev/lib/python3.9/collections/__init__.py:933, in ChainMap.__missing__(self, key) 932 def __missing__(self, key): --> 933 raise KeyError(key) KeyError: 'df' During handling of the above exception, another exception occurred: KeyError Traceback (most recent call last) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/scope.py:242, in Scope.resolve(self, key, is_local) 238 try: 239 # last ditch effort we look in temporaries 240 # these are created when parsing indexing expressions 241 # e.g., df[df > 0] --> 242 return self.temps[key] 243 except KeyError as err: KeyError: 'df' The above exception was the direct cause of the following exception: UndefinedVariableError Traceback (most recent call last) Cell In[3], line 1 ----> 1 pd.eval('df + 1') File ~/sources/modin/modin/core/storage_formats/pandas/query_compiler_caster.py:1070, in wrap_function_in_argument_caster.<locals>.f_with_argument_casting(*args, **kwargs) 1056 if len(input_backends) < 2 and ( 1057 not AutoSwitchBackend.get() or pin_target_backend is not None 1058 ): 1059 f_to_apply = _get_extension_for_method( 1060 name=name, 1061 extensions=extensions, (...) 1068 wrapping_function_type=wrapping_function_type, 1069 ) -> 1070 result = f_to_apply(*args, **kwargs) 1071 if ( 1072 isinstance(result, QueryCompilerCaster) 1073 and pin_target_backend is not None 1074 ): 1075 result._set_backend_pinned(True, inplace=True) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/eval.py:336, in eval(expr, parser, engine, local_dict, global_dict, resolvers, level, target, inplace) 327 # get our (possibly passed-in) scope 328 env = ensure_scope( 329 level + 1, 330 global_dict=global_dict, (...) 333 target=target, 334 ) --> 336 parsed_expr = Expr(expr, engine=engine, parser=parser, env=env) 338 if engine == "numexpr" and ( 339 is_extension_array_dtype(parsed_expr.terms.return_type) 340 or getattr(parsed_expr.terms, "operand_types", None) is not None (...) 344 ) 345 ): 346 warnings.warn( 347 "Engine has switched to 'python' because numexpr does not support " 348 "extension array dtypes. Please set your engine to python manually.", 349 RuntimeWarning, 350 stacklevel=find_stack_level(), 351 ) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:805, in Expr.__init__(self, expr, engine, parser, env, level) 803 self.parser = parser 804 self._visitor = PARSERS[parser](self.env, self.engine, self.parser) --> 805 self.terms = self.parse() File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:824, in Expr.parse(self) 820 def parse(self): 821 """ 822 Parse an expression. 823 """ --> 824 return self._visitor.visit(self.expr) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:411, in BaseExprVisitor.visit(self, node, **kwargs) 409 method = f"visit_{type(node).__name__}" 410 visitor = getattr(self, method) --> 411 return visitor(node, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:417, in BaseExprVisitor.visit_Module(self, node, **kwargs) 415 raise SyntaxError("only a single expression is allowed") 416 expr = node.body[0] --> 417 return self.visit(expr, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:411, in BaseExprVisitor.visit(self, node, **kwargs) 409 method = f"visit_{type(node).__name__}" 410 visitor = getattr(self, method) --> 411 return visitor(node, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:420, in BaseExprVisitor.visit_Expr(self, node, **kwargs) 419 def visit_Expr(self, node, **kwargs): --> 420 return self.visit(node.value, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:411, in BaseExprVisitor.visit(self, node, **kwargs) 409 method = f"visit_{type(node).__name__}" 410 visitor = getattr(self, method) --> 411 return visitor(node, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:531, in BaseExprVisitor.visit_BinOp(self, node, **kwargs) 530 def visit_BinOp(self, node, **kwargs): --> 531 op, op_class, left, right = self._maybe_transform_eq_ne(node) 532 left, right = self._maybe_downcast_constants(left, right) 533 return self._maybe_evaluate_binop(op, op_class, left, right) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:451, in BaseExprVisitor._maybe_transform_eq_ne(self, node, left, right) 449 def _maybe_transform_eq_ne(self, node, left=None, right=None): 450 if left is None: --> 451 left = self.visit(node.left, side="left") 452 if right is None: 453 right = self.visit(node.right, side="right") File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:411, in BaseExprVisitor.visit(self, node, **kwargs) 409 method = f"visit_{type(node).__name__}" 410 visitor = getattr(self, method) --> 411 return visitor(node, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/expr.py:541, in BaseExprVisitor.visit_Name(self, node, **kwargs) 540 def visit_Name(self, node, **kwargs) -> Term: --> 541 return self.term_type(node.id, self.env, **kwargs) File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/ops.py:91, in Term.__init__(self, name, env, side, encoding) 89 tname = str(name) 90 self.is_local = tname.startswith(LOCAL_TAG) or tname in DEFAULT_GLOBALS ---> 91 self._value = self._resolve_name() 92 self.encoding = encoding File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/ops.py:115, in Term._resolve_name(self) 110 if local_name in self.env.scope and isinstance( 111 self.env.scope[local_name], type 112 ): 113 is_local = False --> 115 res = self.env.resolve(local_name, is_local=is_local) 116 self.update(res) 118 if hasattr(res, "ndim") and res.ndim > 2: File ~/miniconda3/envs/modin-dev/lib/python3.9/site-packages/pandas/core/computation/scope.py:244, in Scope.resolve(self, key, is_local) 242 return self.temps[key] 243 except KeyError as err: --> 244 raise UndefinedVariableError(key, is_local) from err UndefinedVariableError: name 'df' is not defined