Index: Lib/calendar.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/calendar.py,v
retrieving revision 1.34
diff -u -r1.34 calendar.py
--- Lib/calendar.py	7 Jun 2004 03:47:06 -0000	1.34
+++ Lib/calendar.py	12 Nov 2004 19:52:02 -0000
@@ -22,6 +22,12 @@
 # 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]
 
+_proto_months = [datetime.date(2001, i+1, 1).strftime for i in range(12)]
+_proto_months.insert(0, lambda x: "")
+
+# January 1, 2001, was a Monday.
+_proto_days = [datetime.date(2001, 1, i+1).strftime for i in range(7)]
+
 # This module used to have hard-coded lists of day and month names, as
 # English strings.  The classes following emulate a read-only version of
 # that, but supply localized names.  Note that the values are computed
@@ -32,10 +38,10 @@
         self.format = format
 
     def __getitem__(self, i):
-        data = [datetime.date(2001, j, 1).strftime(self.format)
-                     for j in range(1, 13)]
-        data.insert(0, "")
-        return data[i]
+        if isinstance(i, slice):
+            return [f(self.format) for f in _proto_months[i]]
+        else:
+            return _proto_months[i](self.format)
 
     def __len__(self):
         return 13
@@ -45,10 +51,10 @@
         self.format = format
 
     def __getitem__(self, i):
-        # January 1, 2001, was a Monday.
-        data = [datetime.date(2001, 1, j+1).strftime(self.format)
-                     for j in range(7)]
-        return data[i]
+        if isinstance(i, slice):
+            return [f(self.format) for f in _proto_days[i]]
+        else:
+            return _proto_days[i](self.format)
 
     def __len__(self):
         return 7