BUG: DateRange.copy did not produce well-formed object. fixes GH #168

Author: wesm

RELEASE.rst

@@ -54,6 +54,8 @@ improvements
   - Excluding OLS degenerate unit test case that was causing platform specific
     failure (GH #149)
   - Skip blosc-dependent unit tests for PyTables < 2.2 (PR #137)
+  - Calling `copy` on `DateRange` did not copy over attributes to the new object
+    (GH #168)
 
 Thanks
 ------

pandas/core/index.py

@@ -433,6 +433,14 @@ def drop(self, labels):
             raise ValueError('labels %s not contained in axis' % labels[-mask])
         return self.delete(indexer)
 
+    def copy(self, order='C'):
+        """
+        Overridden ndarray.copy to copy over attributes
+        """
+        cp = self.view(np.ndarray).copy(order).view(type(self))
+        cp.__dict__.update(self.__dict__)
+        return cp
+
     #----------------------------------------------------------------------
     # deprecated stuff
 

pandas/tests/test_daterange.py

@@ -83,6 +83,11 @@ def test_comparison(self):
         self.assert_(comp[11])
         self.assert_(not comp[9])
 
+    def test_copy(self):
+        cp = self.rng.copy()
+        repr(cp)
+        self.assert_(cp.equals(self.rng))
+
     def test_repr(self):
         # only really care that it works
         repr(self.rng)