input: from typing import List
  
  def fix_syntax_errors(code: List[str]) -> List[str]:
      """
      An algorithm to detect and fix syntax errors in a given Python code snippet.
      If a variable is left undefined, wrap it in a try-except block to catch the NameError.
      
      >>> fix_syntax_errors(['def test():', '    x = 5', '    y = 3', '    z'])
      ['def test():', '    x = 5', '    y = 3', '    try:', '        z', '    except NameError:', '        print("NameError: Name \'z\' is not defined")']
      """
output:     for i in range(len(code)):
          if code[i].strip().endswith(':'):
              continue
          if '=' not in code[i] and 'def' not in code[i] and 'class' not in code[i]:
              code[i] = '    try:\n' + ' ' * 8 + code[i].strip() + '\n' + ' ' * 4 + 'except NameError:\n' + ' ' * 8 + 'print("NameError: Name \'{}\' is not defined")'.format(code[i].strip().split()[0])
      return code