update to holiday to help with GH#7070

doc/source/v0.15.0.txt

@@ -299,6 +299,8 @@ Enhancements
 
 
 - ``PeriodIndex`` supports ``resolution`` as the same as ``DatetimeIndex`` (:issue:`7708`)
+-``pandas.tseries.holiday`` has added support for additional holidays and ways to observe holidays (:issue: `7070`)
+-``pandas.tseries.holiday.Holiday`` now supports a list of offsets in Python3 (:issue: `7070`)
 
 
 

pandas/tseries/holiday.py

@@ -2,6 +2,7 @@
 from pandas.compat import add_metaclass
 from datetime import datetime, timedelta
 from dateutil.relativedelta import MO, TU, WE, TH, FR, SA, SU
+from pandas.tseries.offsets import Easter, Day
 
 def next_monday(dt):
     """
@@ -46,6 +47,20 @@ def sunday_to_monday(dt):
         return dt + timedelta(1)
     return dt
 
+
+def weekend_to_monday(dt):
+    """
+    If holiday falls on Sunday or Saturday,
+    use day thereafter (Monday) instead.
+    Needed for holidays such as Christmas observation in Europe
+    """
+    if dt.weekday() == 6:
+        return dt + timedelta(1)
+    elif dt.weekday() == 5:
+        return dt + timedelta(2)
+    return dt
+
+
 def nearest_workday(dt):
     """
     If holiday falls on Saturday, use day before (Friday) instead;
@@ -57,13 +72,62 @@ def nearest_workday(dt):
         return dt + timedelta(1)
     return dt
 
+
+def next_workday(dt):
+    """
+    returns next weekday used for observances
+    """
+    dt += timedelta(days=1)
+    while dt.weekday() > 4:
+        # Mon-Fri are 0-4
+        dt += timedelta(days=1)
+    return dt
+
+
+def previous_workday(dt):
+    """
+    returns previous weekday used for observances
+    """
+    dt -= timedelta(days=1)
+    while dt.weekday() > 4:
+        # Mon-Fri are 0-4
+        dt -= timedelta(days=1)
+    return dt
+
+
+def before_nearest_workday(dt):
+    """
+    returns previous workday after nearest workday
+    """
+    return previous_workday(nearest_workday(dt))
+
+
+def after_nearest_workday(dt):
+    """
+    returns next workday after nearest workday
+    needed for Boxing day or multiple holidays in a series
+    """
+    return next_workday(nearest_workday(dt))
+
+
 class Holiday(object):
     """
     Class that defines a holiday with start/end dates and rules
     for observance.
     """
     def __init__(self, name, year=None, month=None, day=None, offset=None,
                  observance=None, start_date=None, end_date=None):
+        """
+        Parameters
+        ----------
+        name : str
+            Name of the holiday , defaults to class name
+        offset : array of pandas.tseries.offsets or
+                class from pandas.tseries.offsets
+            computes offset from  date
+        observance: function
+            computes when holiday is given a pandas Timestamp
+        """
         self.name   =   name
         self.year   =   year
         self.month  =   month
@@ -149,7 +213,7 @@ def _apply_rule(self, dates):
             offsets =   self.offset
 
         for offset in offsets:
-            dates = map(lambda d: d + offset, dates)
+            dates = list(map(lambda d: d + offset, dates))
 
         return dates
 
@@ -330,6 +394,11 @@ def merge(self, other, inplace=False):
                                offset=DateOffset(weekday=MO(3)))
 USPresidentsDay      = Holiday('President''s Day', month=2, day=1,
                                offset=DateOffset(weekday=MO(3)))
+GoodFriday = Holiday("Good Friday", month=1, day=1, offset=[Easter(), Day(-2)])
+
+EasterMonday = Holiday("Easter Monday", month=1, day=1, offset=[Easter(), Day(1)])
+
+
 
 class USFederalHolidayCalendar(AbstractHolidayCalendar):
     """

pandas/tseries/tests/test_holiday.py

@@ -6,7 +6,10 @@
     nearest_workday, next_monday_or_tuesday, next_monday,
     previous_friday, sunday_to_monday, Holiday, DateOffset,
     MO, Timestamp, AbstractHolidayCalendar, get_calendar,
-    HolidayCalendarFactory)
+    HolidayCalendarFactory, next_workday, previous_workday,
+    before_nearest_workday, EasterMonday, GoodFriday,
+    after_nearest_workday, weekend_to_monday)
+import nose
 
 class TestCalendar(tm.TestCase):
 
@@ -69,6 +72,37 @@ def test_usmemorialday(self):
                        ]
         self.assertEqual(list(holidays), holidayList)
 
+    def test_easter(self):
+        holidays = EasterMonday.dates(self.start_date,
+                                      self.end_date)
+        holidayList = [Timestamp('2011-04-25 00:00:00'),
+                       Timestamp('2012-04-09 00:00:00'),
+                       Timestamp('2013-04-01 00:00:00'),
+                       Timestamp('2014-04-21 00:00:00'),
+                       Timestamp('2015-04-06 00:00:00'),
+                       Timestamp('2016-03-28 00:00:00'),
+                       Timestamp('2017-04-17 00:00:00'),
+                       Timestamp('2018-04-02 00:00:00'),
+                       Timestamp('2019-04-22 00:00:00'),
+                       Timestamp('2020-04-13 00:00:00')]
+
+
+        self.assertEqual(list(holidays), holidayList)
+        holidays = GoodFriday.dates(self.start_date,
+                                    self.end_date)
+        holidayList = [Timestamp('2011-04-22 00:00:00'),
+                       Timestamp('2012-04-06 00:00:00'),
+                       Timestamp('2013-03-29 00:00:00'),
+                       Timestamp('2014-04-18 00:00:00'),
+                       Timestamp('2015-04-03 00:00:00'),
+                       Timestamp('2016-03-25 00:00:00'),
+                       Timestamp('2017-04-14 00:00:00'),
+                       Timestamp('2018-03-30 00:00:00'),
+                       Timestamp('2019-04-19 00:00:00'),
+                       Timestamp('2020-04-10 00:00:00')]
+        self.assertEqual(list(holidays), holidayList)
+
+
     def test_usthanksgivingday(self):
         holidays = USThanksgivingDay.dates(self.start_date,
                                            self.end_date)
@@ -166,3 +200,33 @@ def test_nearest_workday(self):
         self.assertEqual(nearest_workday(self.su), self.mo)
         self.assertEqual(nearest_workday(self.mo), self.mo)
 
+    def test_weekend_to_monday(self):
+        self.assertEqual(weekend_to_monday(self.sa), self.mo)
+        self.assertEqual(weekend_to_monday(self.su), self.mo)
+        self.assertEqual(weekend_to_monday(self.mo), self.mo)
+
+    def test_next_workday(self):
+        self.assertEqual(next_workday(self.sa), self.mo)
+        self.assertEqual(next_workday(self.su), self.mo)
+        self.assertEqual(next_workday(self.mo), self.tu)
+
+    def test_previous_workday(self):
+        self.assertEqual(previous_workday(self.sa), self.fr)
+        self.assertEqual(previous_workday(self.su), self.fr)
+        self.assertEqual(previous_workday(self.tu), self.mo)
+
+    def test_before_nearest_workday(self):
+        self.assertEqual(before_nearest_workday(self.sa), self.th)
+        self.assertEqual(before_nearest_workday(self.su), self.fr)
+        self.assertEqual(before_nearest_workday(self.tu), self.mo)
+
+    def test_after_nearest_workday(self):
+        self.assertEqual(after_nearest_workday(self.sa), self.mo)
+        self.assertEqual(after_nearest_workday(self.su), self.tu)
+        self.assertEqual(after_nearest_workday(self.fr), self.mo)
+
+
+if __name__ == '__main__':
+    nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],
+                   exit=False)
+