循环访问python中的文件夹并打开文件时抛出错误

import os

folder_path = "path/to/folder"

if os.path.exists(folder_path):
    if os.access(folder_path, os.R_OK):
        for file_name in os.listdir(folder_path):
            file_path = os.path.join(folder_path, file_name)
            if os.path.isfile(file_path):
                try:
                    with open(file_path, 'r') as file:
                        # 处理文件内容
                        pass
                except FileNotFoundError:
                    print(f"文件不存在：{file_path}")
                except IOError:
                    print(f"无法打开文件：{file_path}")
            else:
                print(f"非文件对象：{file_path}")
    else:
        print("文件夹访问权限不足")
else:
    print("文件夹不存在")