code: def __add__(self, other):
      assert isinstance(other, _string_types)
      return str(self.val + other.val)
  
file_path: turicreate/src/external/coremltools_wrap/coremltools/coremltools/converters/mil/mil/types/type_str.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from .annotate import class_annotate, annotate, delay_type
  from .type_spec import Type
  from six import string_types
label_desc: Use image node_id 3 for calling the str obj's underlying member method code with example usage: obj.__add__(other) and returns: str