code: def _isconvertible(conv, string):
      try:
          n = conv(string)
          return True
      except ValueError:
          return False
  
imports: from __future__ import print_function
  from __future__ import unicode_literals
  from collections import namedtuple
  from platform import python_version_tuple
  import re
label_desc: Use image node_id 6 for calling a global function with example usage: _isconvertible(conv, string) and returns: True, False