input: def fix_python_syntax_errors(code_snippet: str) -> str:
      """
      Develop an algorithm to detect and fix Python syntax errors in a given code snippet.
      >>> fix_python_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:     import ast
      import astor
  
      class SyntaxFixer(ast.NodeTransformer):
          def visit_Assign(self, node):
              if isinstance(node.targets[0], ast.Name) and node.targets[0].id == 'z':
                  return ast.Try(
                      body=[node],
                      handlers=[ast.ExceptHandler(
                          type=ast.Name(id='NameError', ctx=ast.Load()),
                          name=None,
                          body=[ast.Expr(
                              value=ast.Call(
                                  func=ast.Name(id='print', ctx=ast.Load()),
                                  args=[ast.Str(s="NameError: Name 'z' is not defined")],
                                  keywords=[]
                              )
                          )]
                      )],
                      orelse=[],
                      finalbody=[]
                  )
              return node
  
      try:
          tree = ast.parse(code_snippet)
          fixed_tree = SyntaxFixer().visit(tree)
          fixed_code = astor.to_source(fixed_tree)
      except SyntaxError:
          fixed_code = code_snippet
  
      return fixed_code