BUG: QS and BQ alias #1725

Author: changhiskhan

pandas/tseries/frequencies.py

@@ -175,7 +175,7 @@ def _get_freq_str(base, mult=1):
     'Q-DEC' : QuarterEnd(startingMonth=12),
 
     # Quarterly - Calendar (Start)
-    # 'QS'     : QuarterBegin(startingMonth=1),
+    'QS'     : QuarterBegin(startingMonth=1),
     'QS-JAN' : QuarterBegin(startingMonth=1),
     'QS-FEB' : QuarterBegin(startingMonth=2),
     'QS-MAR' : QuarterBegin(startingMonth=3),
@@ -194,7 +194,7 @@ def _get_freq_str(base, mult=1):
     'BQ-FEB' : BQuarterEnd(startingMonth=2),
     'BQ-MAR' : BQuarterEnd(startingMonth=3),
 
-    # 'BQ'     : BQuarterEnd(startingMonth=3),
+    'BQ'     : BQuarterEnd(startingMonth=12),
     'BQ-APR' : BQuarterEnd(startingMonth=4),
     'BQ-MAY' : BQuarterEnd(startingMonth=5),
     'BQ-JUN' : BQuarterEnd(startingMonth=6),

pandas/tseries/tests/test_timeseries.py

@@ -1810,6 +1810,18 @@ def test_datetimeindex_constructor(self):
         self.assertEquals(len(idx1), len(idx2))
         self.assertEquals(idx1.offset, idx2.offset)
 
+        idx1 = DatetimeIndex(start=sdate, end=edate, freq='QS')
+        idx2 = DatetimeIndex(start=sdate, end=edate,
+                             freq=dt.QuarterBegin(startingMonth=1))
+        self.assertEquals(len(idx1), len(idx2))
+        self.assertEquals(idx1.offset, idx2.offset)
+
+        idx1 = DatetimeIndex(start=sdate, end=edate, freq='BQ')
+        idx2 = DatetimeIndex(start=sdate, end=edate,
+                             freq=dt.BQuarterEnd(startingMonth=12))
+        self.assertEquals(len(idx1), len(idx2))
+        self.assertEquals(idx1.offset, idx2.offset)
+
     def test_dti_snap(self):
         dti = DatetimeIndex(['1/1/2002', '1/2/2002', '1/3/2002', '1/4/2002',
                              '1/5/2002', '1/6/2002', '1/7/2002'], freq='D')