def getPreviousBookCode( self, BBB ):
""" Returns the book (if any) before the given one. """
while True:
previousCode = BibleBookOrderSystem.getPreviousBookCode( self, BBB )
if previousCode is None: return None
if self.containsBook( previousCode ): return previousCode
BBB = previousCode
def getPreviousBookCode( self, BBB ):
""" Returns the book (if any) before the given one. """
while True:
previousCode = BibleBookOrderSystem.getPreviousBookCode( self, BBB )
if previousCode is None: return None
if self.containsBook( previousCode ): return previousCode
BBB = previousCode
