class_docstr: The provided 'callable' is not actually a callable.
class_docstr_tok: ["The","provided","'callable","'","is","not","actually","a","callable","."]
code: def __str__(self):
      return "%s is not callable" % self.format_callable()
  
imports: from collections import namedtuple
  import inspect
  from itertools import chain
  from six.moves import map, zip_longest
  from catalyst.errors import ZiplineError
label_desc: Use image node_id 2 for calling the NotCallable obj's underlying member method code with example usage: obj.__str__() and returns: unknown