ENH: ~ for DataFrame #2110

Author: changhiskhan

pandas/core/frame.py

@@ -176,8 +176,6 @@ class DataConflictError(Exception):
 
 #----------------------------------------------------------------------
 # Factory helper methods
-
-
 def _arith_method(op, name, default_axis='columns'):
     def na_op(x, y):
         try:
@@ -702,6 +700,10 @@ def __neg__(self):
         arr = operator.neg(self.values)
         return self._wrap_array(arr, self.axes, copy=False)
 
+    def __invert__(self):
+        arr = operator.inv(self.values)
+        return self._wrap_array(arr, self.axes, copy=False)
+
     # Comparison methods
     __eq__ = _comp_method(operator.eq, '__eq__')
     __ne__ = _comp_method(operator.ne, '__ne__')

pandas/tests/test_frame.py

@@ -2966,6 +2966,9 @@ def test_neg(self):
         # what to do?
         assert_frame_equal(-self.frame, -1 * self.frame)
 
+    def test_invert(self):
+        assert_frame_equal(-(self.frame < 0), ~(self.frame <0))
+
     def test_first_last_valid(self):
         N = len(self.frame.index)
         mat = randn(N)