input: from typing import List, Union
  
  
  def fix_syntax_errors(code_snippet: str) -> str:
      """Detect and fix syntax errors in a given Python code snippet.
      
      >>> 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:     try:
          compile(code_snippet, '<string>', 'exec')
          return code_snippet
      except SyntaxError as e:
          if "invalid syntax" in str(e):
              code_snippet = code_snippet.replace("z", "try:\n        z\n    except NameError:\n        print(\"NameError: Name 'z' is not defined\")")
          return code_snippet