code: def _isnumber(string):
      """
      >>> _isnumber("123.45")
      True
      >>> _isnumber("123")
      True
      >>> _isnumber("spam")
      False
      """
      return _isconvertible(float, string)
  
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 7 for calling a global function with example usage: _isnumber(string) and returns: _isconvertible