code: def _make_explanation(a, b):
      """Explanation for a failed assert -- the a and b arguments are List[str]"""
      return ["--- actual / +++ expected"] + [
          line.strip("\n") for line in difflib.ndiff(a, b)
      ]
  
imports: import pytest
  import textwrap
  import difflib
  import re
  import sys
  import contextlib
  import platform
  import gc
label_desc: Use image node_id 3 for calling a global function with example usage: _make_explanation(a, b) and returns: unknown