code: def test_mixed_types_content(self):
      # type of input content must be consistent: all str or all bytes
      a = [b"hello"]
      b = ["hello"]
  
      unified = difflib.unified_diff
      context = difflib.context_diff
  
      expect = "lines to compare must be str, not bytes (b'hello')"
      self._assert_type_error(expect, unified, a, b)
      self._assert_type_error(expect, unified, b, a)
      self._assert_type_error(expect, context, a, b)
      self._assert_type_error(expect, context, b, a)
  
      expect = "all arguments must be bytes, not str ('hello')"
      self._assert_type_error(expect, difflib.diff_bytes, unified, a, b)
      self._assert_type_error(expect, difflib.diff_bytes, unified, b, a)
      self._assert_type_error(expect, difflib.diff_bytes, context, a, b)
      self._assert_type_error(expect, difflib.diff_bytes, context, b, a)
  
imports: import difflib
  from test.support import findfile
  import unittest
  import doctest
  import sys
label_desc: Use image node_id 4 for calling the TestBytes obj's underlying member method code with example usage: obj.test_mixed_types_content() without return types