BUG: PeriodIndex.tolist boxes to list of Periods #3178

Author: changhiskhan

RELEASE.rst

@@ -228,6 +228,7 @@ pandas 0.11.0
   - Fixed bug in groupby apply when kernel generate list of arrays having unequal len (GH1738_)
   - fixed handling of rolling_corr with center=True which could produce corr>1 (GH3155_)
   - Fixed issues where indices can be passed as 'index/column' in addition to 0/1 for the axis parameter
+  - PeriodIndex.tolist now boxes to Period (GH3178_)
 
 .. _GH622: https://github.com/pydata/pandas/issues/622
 .. _GH797: https://github.com/pydata/pandas/issues/797
@@ -301,6 +302,7 @@ pandas 0.11.0
 .. _GH3075: https://github.com/pydata/pandas/issues/3075
 .. _GH3094: https://github.com/pydata/pandas/issues/3094
 .. _GH3130: https://github.com/pydata/pandas/issues/3130
+.. _GH3178: https://github.com/pydata/pandas/issues/3178
 
 pandas 0.10.1
 =============

pandas/tseries/period.py

@@ -768,6 +768,12 @@ def _mpl_repr(self):
         # how to represent ourselves to matplotlib
         return self._get_object_array()
 
+    def tolist(self):
+        """
+        Return a list of Period objects
+        """
+        return self._get_object_array().tolist()
+
     def to_timestamp(self, freq=None, how='start'):
         """
         Cast to DatetimeIndex

pandas/tseries/tests/test_period.py

@@ -1226,6 +1226,14 @@ def test_periods_number_check(self):
         self.assertRaises(
             ValueError, period_range, '2011-1-1', '2012-1-1', 'B')
 
+    def test_tolist(self):
+        index = PeriodIndex(freq='A', start='1/1/2001', end='12/1/2009')
+        rs = index.tolist()
+        [self.assert_(isinstance(x, Period)) for x in rs]
+
+        recon = PeriodIndex(rs)
+        self.assert_(index.equals(recon))
+
     def test_to_timestamp(self):
         index = PeriodIndex(freq='A', start='1/1/2001', end='12/1/2009')
         series = Series(1, index=index, name='foo')