class_docstr: Methods in this class recursively traverse an AST and
  output source code for the abstract syntax; original formatting
  is disregarged.
code: def _float(self, t):
      # if t is 0.1, str(t)->'0.1' while repr(t)->'0.1000000000001'
      # We prefer str here.
      self._write(str(t))
  
imports: import sys
  from compiler.ast import Const, Name, Tuple, Div, Mul, Sub, Add
label_desc: Use image node_id 54 for calling the UnparseCompilerAst obj's underlying member method code with example usage: obj._float(t) without return types