diff --git a/Lib/calendar.py b/Lib/calendar.py
index 657396439c91fcb..37c2f53a3ab5482 100644
--- a/Lib/calendar.py
+++ b/Lib/calendar.py
@@ -7,6 +7,7 @@
 
 import sys
 import datetime
+from enum import IntEnum
 import locale as _locale
 from itertools import repeat
 
@@ -16,7 +17,10 @@
            "timegm", "month_name", "month_abbr", "day_name", "day_abbr",
            "Calendar", "TextCalendar", "HTMLCalendar", "LocaleTextCalendar",
            "LocaleHTMLCalendar", "weekheader",
-           "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY",
+           "Weekdays","Months", "JANUARY", "FEBRUARY", "MARCH", 
+           "APRIL", "MAY", "JUNE", "JULY", 
+           "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMEMBER", "DECEMBER",
+           "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", 
            "SATURDAY", "SUNDAY"]
 
 # Exception raised for bad input (with string parameter for details)
@@ -38,8 +42,34 @@ def __str__(self):
 
 
 # Constants for months referenced later
-January = 1
-February = 2
+class Months(IntEnum):
+    JANUARY = 1
+    FEBRUARY = 2
+    MARCH = 3
+    APRIL = 4
+    MAY = 5 
+    JUNE = 6
+    JULY = 7
+    AUGUST = 8
+    SEPTEMBER = 9
+    OCTOBER = 10
+    NOVEMEMBER = 11
+    DECEMBER = 12
+
+(JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMEMBER, DECEMBER) = [month.value for month in Months]
+
+# Constants for weekdays
+class Weekdays(IntEnum):
+    MONDAY = 0
+    TUESDAY = 1
+    WEDNESDAY = 2
+    THURSDAY = 3
+    FRIDAY = 4
+    SATURDAY = 5
+    SUNDAY = 6
+
+# Constants for weekdays
+(MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY) = [week.value for week in Weekdays]
 
 # Number of days per month (except for February in leap years)
 mdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
@@ -95,9 +125,6 @@ def __len__(self):
 month_name = _localized_month('%B')
 month_abbr = _localized_month('%b')
 
-# Constants for weekdays
-(MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY) = range(7)
-
 
 def isleap(year):
     """Return True for leap years, False for non-leap years."""
@@ -125,12 +152,12 @@ def monthrange(year, month):
     if not 1 <= month <= 12:
         raise IllegalMonthError(month)
     day1 = weekday(year, month, 1)
-    ndays = mdays[month] + (month == February and isleap(year))
+    ndays = mdays[month] + (month == FEBRUARY and isleap(year))
     return day1, ndays
 
 
 def _monthlen(year, month):
-    return mdays[month] + (month == February and isleap(year))
+    return mdays[month] + (month == FEBRUARY and isleap(year))
 
 
 def _prevmonth(year, month):
@@ -262,7 +289,7 @@ def yeardatescalendar(self, year, width=3):
         """
         months = [
             self.monthdatescalendar(year, i)
-            for i in range(January, January+12)
+            for i in range(JANUARY, JANUARY+12)
         ]
         return [months[i:i+width] for i in range(0, len(months), width) ]
 
@@ -275,7 +302,7 @@ def yeardays2calendar(self, year, width=3):
         """
         months = [
             self.monthdays2calendar(year, i)
-            for i in range(January, January+12)
+            for i in range(JANUARY,JANUARY+12)
         ]
         return [months[i:i+width] for i in range(0, len(months), width) ]
 
@@ -287,7 +314,7 @@ def yeardayscalendar(self, year, width=3):
         """
         months = [
             self.monthdayscalendar(year, i)
-            for i in range(January, January+12)
+            for i in range(JANUARY, JANUARY+12)
         ]
         return [months[i:i+width] for i in range(0, len(months), width) ]
 
@@ -509,7 +536,7 @@ def formatyear(self, theyear, width=3):
         a('\n')
         a('<tr><th colspan="%d" class="%s">%s</th></tr>' % (
             width, self.cssclass_year_head, theyear))
-        for i in range(January, January+12, width):
+        for i in range(JANUARY, JANUARY+12, width):
             # months in this row
             months = range(i, min(i+width, 13))
             a('<tr>')