Holidays in Belarus + codestyle (#1380)

* Holidays in Belarus + codestyle

* Correction + changing hardcode with variable

python/fbprophet/hdays.py

@@ -15,7 +15,7 @@ from lunarcalendar import Lunar, Converter
 from lunarcalendar.converter import DateNotExist
 
 from holidays import WEEKEND, HolidayBase
-from dateutil.easter import easter
+from dateutil.easter import easter, EASTER_ORTHODOX
 from dateutil.relativedelta import relativedelta as rd
 
 
@@ -1185,7 +1185,7 @@ class Egypt(HolidayBase):
         # The Monday following Orthodox Easter
         name = "Sham El Nessim"
         for offset in range(-1, 2, 1):
-            orthodox_easter = easter(year + offset, method=2)
+            orthodox_easter = easter(year + offset, method=EASTER_ORTHODOX)
             ds = orthodox_easter + timedelta(days=1)
             if ds.year == year:
                 self[ds] = name
@@ -1300,6 +1300,7 @@ class China(HolidayBase):
 class CN(China):
     pass
 
+
 # ------------ Holidays in Russia---------------------
 class Russia(HolidayBase):
     """
@@ -1362,6 +1363,7 @@ class Russia(HolidayBase):
 class RU(Russia):
     pass
 
+
 # ------------ Holidays in Republic of Korea---------------------
 class Korea(HolidayBase):
     """
@@ -1430,3 +1432,62 @@ class Korea(HolidayBase):
 
 class KR(Korea):
     pass
+
+
+# ------------ Holidays in Belarus---------------------
+class Belarus(HolidayBase):
+    """
+    Implement public holidays in Belarus
+
+    Reference:
+    https://en.wikipedia.org/wiki/Public_holidays_in_Belarus
+
+    Please note:
+    Some holidays might collide with weekends and therefore not compensated with next business day
+    as International Women's Day
+    """
+
+    def __init__(self, **kwargs):
+        self.country = "BY"
+        HolidayBase.__init__(self, **kwargs)
+
+    def _populate(self, year):
+        # New Year's Day
+        name = "New Year's Day"
+        self[date(year, 1, 1)] = name
+
+        # Orthodox Christmas day
+        name = "Orthodox Christmas Day"
+        self[date(year, 1, 7)] = name
+
+        # International Women's Day
+        name = "International Women's Day"
+        self[date(year, 3, 8)] = name
+
+        # Commemoration Day
+        name = "Commemoration Day"
+        self[easter(year, EASTER_ORTHODOX) + timedelta(days=9)] = name
+
+        # Spring and Labour Day
+        name = "Spring and Labour Day"
+        self[date(year, 5, 1)] = name
+
+        # Victory Day
+        name = "Victory Day"
+        self[date(year, 5, 9)] = name
+
+        # Independence Day
+        name = "Independence Day"
+        self[date(year, 7, 3)] = name
+
+        # October Revolution Day
+        name = "October Revolution Day"
+        self[date(year, 11, 7)] = name
+
+        # Dec. 25 Christmas Day
+        name = "Christmas Day"
+        self[date(year, 12, 25)] = name
+
+
+class BY(Belarus):
+    pass