class_docstr: Base class to add information on a node to improve code generation. 
class_docstr_tok: ["Base","class","to","add","information","on","a","node","to","improve","code","generation","."]
docstr: Add a metadata information. 
docstr_tok: ["Add","a","metadata","information","."]
code: def append(self, data):
      """Add a metadata information."""
      self.data.append(data)
  
file_path: catboost/contrib/python/pythran/pythran/metadata.py
imports: from gast import AST
label_desc: Use image node_id 3 for calling the Metadata obj's underlying member method code with example usage: obj.append(data) without return types