code: def test_unicode_unpack_prefix(self):
      sf = tc.SFrame({"a": [{"x": 1}, {"x": 2}, {"x": 3}]})
      sf = sf.unpack("a", "\u00aa")
      for col in sf.column_names():
          if six.PY2:
              # column names come out as str
              self.assertTrue(col.startswith("\u00aa".encode("utf-8")))
          else:
              # column names come out as unicode
              self.assertTrue(col.startswith("\u00aa"))
  
file_path: turicreate/src/python/turicreate/test/test_unicode_strings.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import six
  import unittest
  import turicreate
  import pytest
label_desc: Use image node_id 2 for calling the UnicodeStringTest obj's underlying member method code with example usage: obj.test_unicode_unpack_prefix() without return types