class_docstr: Methods in this class recursively traverse an AST and
  output source code for the abstract syntax; original formatting
  is disregarged.
docstr: Append a piece of text to the current line.
docstr_tok: ["Append","a","piece","of","text","to","the","current","line","."]
code: def _write(self, text):
      "Append a piece of text to the current line."
      self.f.write(text)
  
imports: import sys
  from compiler.ast import Const, Name, Tuple, Div, Mul, Sub, Add
label_desc: Use image node_id 3 for calling the UnparseCompilerAst obj's underlying member method code with example usage: obj._write(text) without return types