code: def getTypeID(self, tableClass):
          
          key = (tableClass.typeName,
                 tableClass.schemaVersion)
          if key in self.typenameAndVersionToID:
              return self.typenameAndVersionToID[key]
          return self.transact(self._maybeCreateTable, tableClass, key)
docs: Retrieve the typeID associated with a particular table in the
          in-database schema for this Store.  A typeID is an opaque integer
          representing the Item subclass, and the associated table in this
          Store's SQLite database.
  
          @param tableClass: a subclass of Item
  
          @return: an integer