求助：想批量下载网页上的图片，已经识别出来4张，可是下载2张后报错。

求助：想批量下载网页上的图片，已经识别出来4张，可是下载2张后报错，我看到打印图片地址好像后两张的地址是None 

报错内容如下：

expected string or bytes-like objectTraceback (most recent call last): File "D:\ShadowBot\shadowbot-5.6.26\python\lib\runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "D:\ShadowBot\shadowbot-5.6.26\python\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "D:\ShadowBot\shadowbot-5.6.26\python\lib\site-packages\xbot_interpreter.py", line 67, in <module> main() File "D:\ShadowBot\shadowbot-5.6.26\python\lib\site-packages\xbot_interpreter.py", line