class_docstr: Methods in this class recursively traverse an AST and
  output source code for the abstract syntax; original formatting
  is disregarged.
class_docstr_tok: ["Methods","in","this","class","recursively","traverse","an","AST","and","output","source","code","for","the","abstract","syntax",";","original","formatting","is","disregarged","."]
docstr: Tuple on left hand side of an expression.
          
code: def _AssTuple(self, t):
      """Tuple on left hand side of an expression."""
  
      # _write each elements, separated by a comma.
      for element in t.nodes[:-1]:
          self._dispatch(element)
          self._write(", ")
  
      # Handle the last one without writing comma
      last_element = t.nodes[-1]
      self._dispatch(last_element)
  
imports: from __future__ import division, absolute_import, print_function
  import sys
  from compiler.ast import Const, Name, Tuple, Div, Mul, Sub, Add
label_desc: Use image node_id 12 for calling the UnparseCompilerAst obj's underlying member method code with example usage: obj._AssTuple(t) without return types