input: def fix_syntax_errors(code_snippet: str) -> str:
      """ Detect and fix Python syntax errors in a given code snippet by wrapping undefined references in a try-except block for NameError.
      >>> fix_syntax_errors("def test():\\n    x = 5\\n    y = 3\\n    z")
      "def test():\\n    x = 5\\n    y = 3\\n    try:\\n        z\\n    except NameError:\\n        print(\\"NameError: Name 'z' is not defined\\")"
      """
output:     lines = code_snippet.split('\n')
      fixed_lines = []
      for line in lines:
          if '=' not in line and not line.strip().startswith('#'):
              fixed_lines.append(f"    try:\n        {line}\n    except NameError:\n        print(\"NameError: Name '{line.strip()}' is not defined\")")
          else:
              fixed_lines.append(line)
      return '\n'.join(fixed_lines)