AttributeError: 'str' object has no attribute 'content'如何解决

    for web in web_list:
            for j in range(2,9):
                pic_web = 'https://www.jj20.com/mx/dalu/nan/baijingting/2386'+ str(i) +'_' +str(j) +'.html'
                response = requests.get(pic_web,headers=headers)
                html = response.text
                picture = re.findall('<img id="bigImg" src="(.*?)" alt=".*?">', html)
                picture = 'https:' + ''.join(picture)
                print(picture)
                file_name = picture.split('/')[-1]
                print(file_name)
                with open(r'E:\pycharm\第一个库\爬虫\白敬亭'+ '/' + file_name,'wb') as f:
                    f.write(picture.content)

一直显示AttributeError: 'str' object has no attribute 'content'

    for web in web_list:
        
        for j in range(2,9):
            pic_web = 'https://www.jj20.com/mx/dalu/nan/baijingting/2386'+ str(i) +'_' +str(j) +'.html'
            response = requests.get(pic_web,headers=headers)
            html = response.text
            picture = re.findall('<img id="bigImg" src="(.*?)" alt=".*?">', html)
            picture = 'https:' + ''.join(picture)
            print(picture)
            file_name = picture.split('/')[-1]
            print(file_name)
            
            picture = requests.get(picture,headers=headers)
            
            with open(r'E:\pycharm\第一个库\爬虫\白敬亭'+ '/' + file_name,'wb') as f:
                f.write(picture.content)