Add Angola holidays

https://pt.wikipedia.org/wiki/Feriados_em_Angola
http://www.consuladogeral-angola.pt/feriados-nacionais/

Issue workalendar#276

Changelog.md

@@ -1,7 +1,9 @@
 # CHANGELOG
 
 ## master (unreleased)
-
+- Added Angola, by @dvdmgl (#276)
+- Portugal - removed carnival from Portuguese holidays, restored missing holidays (#275)
+- Added All Souls Day to common (#274)
 - Allow the `add_working_days()` function to be provided a datetime, and returning a `date` (#270).
 - Added a `keep_datetime` option to keep the original type of the input argument for both ``add_working_days()`` and ``sub_working_days()`` functions (#270).
 - Fixed usage examples of ``get_first_weekday_after()`` docstring + in code (calendars and tests) ; do not use magic values, use MON, TUE, etc (#271).

README.rst

@@ -144,6 +144,7 @@ Africa
 ------
 
 * Algeria
+* Angola
 * Benin
 * Ivory Coast
 * Madagascar

workalendar/africa/__init__.py

@@ -8,6 +8,7 @@
 from .madagascar import Madagascar
 from .sao_tome import SaoTomeAndPrincipe
 from .south_africa import SouthAfrica
+from .angola import Angola
 
 
 __all__ = (
@@ -17,4 +18,5 @@
     'Madagascar',
     'SaoTomeAndPrincipe',
     'SouthAfrica',
+    'Angola',
 )

workalendar/africa/angola.py

@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+from __future__ import (absolute_import, division, print_function,
+                        unicode_literals)
+from datetime import timedelta
+from workalendar.core import WesternCalendar
+from workalendar.core import ChristianMixin
+from workalendar.registry import iso_register
+
+
+@iso_register('AO')
+class Angola(WesternCalendar, ChristianMixin):
+    name = 'Angola'
+
+    include_good_friday = True
+    include_easter_sunday = True
+    include_christmas = True
+    include_all_souls = True
+
+    FIXED_HOLIDAYS = WesternCalendar.FIXED_HOLIDAYS + (
+        (2, 4, "Dia do Inicio da Luta Armada"),
+        (3, 8, "Dia Internacional da Mulher"),
+        (4, 4, "Dia da Paz"),
+        (5, 1, "Dia Internacional do Trabalhador"),
+        (9, 17, "Dia do Fundador da Nação e do Herói Nacional"),
+        (11, 11, "Dia da Independência Nacional"),
+    )
+
+    def get_variable_entrudo(self, year):
+        easter_sunday = self.get_easter_sunday(year)
+        return easter_sunday - timedelta(days=47)
+
+    def get_variable_days(self, year):
+        days = super(Angola, self).get_variable_days(year)
+        days.append((self.get_variable_entrudo(year), "Dia de Carnaval"))
+        return days

workalendar/tests/test_africa.py

@@ -1,9 +1,15 @@
 # -*- coding: utf-8 -*-
 from datetime import date
 from workalendar.tests import GenericCalendarTest
-from workalendar.africa import Benin, Algeria
-from workalendar.africa import SouthAfrica, IvoryCoast
-from workalendar.africa import SaoTomeAndPrincipe, Madagascar
+from workalendar.africa import (
+    Algeria,
+    Angola,
+    Benin,
+    IvoryCoast,
+    Madagascar,
+    SaoTomeAndPrincipe,
+    SouthAfrica,
+)
 from workalendar.core import MON
 
 
@@ -207,3 +213,33 @@ def test_year_2013(self):
         self.assertIn(date(2013, 11, 1), holidays)  # All saints
         self.assertIn(date(2013, 12, 21), holidays)  # São Tomé Day
         self.assertIn(date(2013, 12, 25), holidays)  # XMas
+
+
+class AngolaTest(GenericCalendarTest):
+    cal_class = Angola
+
+    def test_year_2018(self):
+        holidays = self.cal.holidays_set(2018)
+        # Dia de Ano Novo – 1 de Janeiro
+        self.assertIn(date(2018, 1, 1), holidays)  # Ano Novo
+        # Dia do Inicio da Luta Armada – 4 de Fevereiro
+        self.assertIn(date(2018, 2, 4), holidays)
+        # Dia do Carnaval – 13 de Fevereiro
+        self.assertIn(date(2018, 2, 13), holidays)  # Entrudo
+        # Dia Internacional da Mulher – 8 de Março
+        self.assertIn(date(2018, 3, 8), holidays)
+        # Dia da Paz – 4 de Abril
+        self.assertIn(date(2018, 4, 4), holidays)  # Dia da Paz
+        # Sexta Feira Santa – 30 de Março
+        self.assertIn(date(2018, 3, 30), holidays)  # Sexta-Feira Santa
+        # Páscoa – 01 de Abril
+        self.assertIn(date(2018, 4, 1), holidays)  # Domingo de Páscoa
+        # Dia Internacional do Trabalhador – 1 de Maio
+        self.assertIn(date(2018, 5, 1), holidays)  # Dia do Trabalhador
+        # Dia do Fundador da Nação e do Herói Nacional – 17 de Setembro
+        self.assertIn(date(2018, 9, 17), holidays)
+        # Dia dos Finados – 2 de Novembro
+        # Dia da Independência Nacional – 11 de Novembro
+        self.assertIn(date(2018, 11, 11), holidays)
+        # Dia do Natal – 25 de Dezembro
+        self.assertIn(date(2018, 12, 25), holidays)  # Natal