code: def assign(self, condition, printer):
      # condition can be a class or an instance of an Op.
      if isinstance(condition, (gof.Op, type)):
          self.printers_dict[condition] = printer
          return
      self.printers.insert(0, (condition, printer))
  
imports: from __future__ import absolute_import, print_function, division
  from copy import copy
  import logging
  import os
  import sys
  import hashlib
  import numpy
  from six import string_types, integer_types, iteritems
  from six.moves import StringIO, reduce
  import theano
  from theano import gof
  from theano import config
  from theano.gof import Op, Apply
  from theano.compile import Function, debugmode, SharedVariable
label_desc: Use image node_id 2 for calling the PPrinter obj's underlying member method code with example usage: obj.assign(condition, printer) without return types