input: from typing import List
  
  
  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):
              lines = code_snippet.split('\n')
              for i, line in enumerate(lines):
                  if '=' in line and not line.strip().endswith(':'):
                      lines[i] = line.rstrip() + '\n    try:\n        ' + line.split('=')[0].strip() + '\n    except NameError:\n        print("NameError: Name \'{}\' is not defined")'.format(line.split('=')[0].strip())
              return '\n'.join(lines)
          else:
              return code_snippet