code: def size(self):
          '''Return the size of all of the files referenced in the database'''
          c = self.database.cursor()
          r = c.execute("SELECT sum(size) FROM files")
  
          try:
              size = int(r.fetchone()[0])
          except TypeError:
              size = 0
  
          return sizf size(self):
          '''Return the size of all of the files referenced in the database'''
          c = self.database.cursor()
          r = c.execute("SELECT sum(size) FROM files")
  
          try:
              size = int(r.fetchone()[0])
          except TypeError:
              size = 0
  
          return size
docs: Return the size of all of the files referenced in the database