Backport r58942:

Fix TextCalendar.prweek(). This closes issue #1427.

Lib/calendar.py

@@ -263,7 +263,7 @@ class TextCalendar(Calendar):
         """
         Print a single week (no newline).
         """
-        print self.week(theweek, width),
+        print self.formatweek(theweek, width),
 
     def formatday(self, day, weekday, width):
         """