code: def lookup(self, name: str, fragment: str = None):
          '''lookup a symbol by name. If symbol is not local
          it will be looked up system wide'''
          if name in self._contentMap:
              symbol = self._contentMap[name]
              if fragment:
                  return symbol._contentMap[fragment]
              return symbol
          return self.system.lookup(namef lookup(self, name: str, fragment: str = None):
          '''lookup a symbol by name. If symbol is not local
          it will be looked up system wide'''
          if name in self._contentMap:
              symbol = self._contentMap[name]
              if fragment:
                  return symbol._contentMap[fragment]
              return symbol
          return self.system.lookup(name)
docs: lookup a symbol by name. If symbol is not local
          it will be looked up system wide