code: def compile(self):
          
          if not isinstance(self.parselet, dict):
              raise ValueError("Parselet must be a dict of some sort. Or use .from_jsonstring(), " \
                  ".from_jsonfile(), .from_yamlstring(), or .from_yamlfile()")
          self.parselet_tree = self._compile(self.parselet)
docs: Build the abstract Parsley tree starting from the root node
          (recursive)