BUG: GH11235 where pd.eval doesn't handle unary ops in lists

Author: kawochen

doc/source/whatsnew/v0.17.1.txt

@@ -94,7 +94,7 @@ Bug Fixes
 
 
 
-
+- Bug in ``pd.eval`` where unary ops in a list error (:issue:`11235`)
 - Bug in ``squeeze()`` with zero length arrays (:issue:`11230`, :issue:`8999`)
 
 

pandas/computation/expr.py

@@ -427,7 +427,7 @@ def visit_Str(self, node, **kwargs):
         return self.term_type(name, self.env)
 
     def visit_List(self, node, **kwargs):
-        name = self.env.add_tmp([self.visit(e).value for e in node.elts])
+        name = self.env.add_tmp([self.visit(e)(self.env) for e in node.elts])
         return self.term_type(name, self.env)
 
     visit_Tuple = visit_List
@@ -655,7 +655,7 @@ def visitor(x, y):
         return reduce(visitor, operands)
 
 # ast.Call signature changed on 3.5,
-# conditionally change  which methods is named
+# conditionally change which methods is named
 # visit_Call depending on Python version, #11097
 if compat.PY35:
     BaseExprVisitor.visit_Call = BaseExprVisitor.visit_Call_35

pandas/computation/tests/test_eval.py

@@ -29,7 +29,7 @@
 import pandas.computation.expr as expr
 import pandas.util.testing as tm
 from pandas.util.testing import (assert_frame_equal, randbool,
-                                 assertRaisesRegexp,
+                                 assertRaisesRegexp, assert_numpy_array_equal,
                                  assert_produces_warning, assert_series_equal)
 from pandas.compat import PY3, u, reduce
 
@@ -609,6 +609,16 @@ def test_scalar_unary(self):
         self.assertEqual(
             pd.eval('+False', parser=self.parser, engine=self.engine), +False)
 
+    def test_unary_in_array(self):
+        # GH 11235
+        assert_numpy_array_equal(
+            pd.eval('[-True, True, ~True, +True,'
+                    '-False, False, ~False, +False,'
+                    '-37, 37, ~37, +37]'),
+            np.array([-True, True, ~True, +True,
+             -False, False, ~False, +False,
+             -37, 37, ~37, +37]))
+
     def test_disallow_scalar_bool_ops(self):
         exprs = '1 or 2', '1 and 2'
         exprs += 'a and b', 'a or b'
@@ -1256,6 +1266,13 @@ def f():
         expected['c'] = expected['a'] + expected['b']
         assert_frame_equal(df, expected)
 
+    def test_column_in(self):
+        # GH 11235
+        df = DataFrame({'a': [11], 'b': [-32]})
+        result = df.eval('a in [11, -32]')
+        expected = Series([True])
+        assert_series_equal(result, expected)
+
     def test_basic_period_index_boolean_expression(self):
         df = mkdf(2, 2, data_gen_f=f, c_idx_type='p', r_idx_type='i')