code: def __enter__(self):
      self.printer._indent = self.printer._indent + self.indent
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ...asttools import Visitor
  import sys
  import _ast
  from warnings import warn
label_desc: Use image node_id 2 for calling the Indentor obj's underlying member method code with example usage: obj.__enter__() without return types