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')