爬取微博内评论，获取评论内容和图片信息
爬取微博内评论。将评论内容和图片进行存储。
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url = url.replace('thumb180', 'bmiddle', 1)
例如：//wx2.sinaimg.cn/thumb180/006CIwoely1g2ol25wd69j30u00u0jy9.jpg
拿到文件名：006CIwoely1g2ol25wd69j30u00u0jy9.jpg，大概是md5编码过的，
然后拼接URL，得到：http://wx3.sinaimg.cn/large/006CIwoely1g2ol25wd69j30u00u0jy9.jpg
就是高清大图的链接~
信息如下：
Traceback (most recent call last):
File "WeiboSuperCommentScrapy.py", line 220, in login
sever_data = self.pre_login()
File "WeiboSuperCommentScrapy.py", line 186, in pre_login
servertime = sever_data["servertime"]
KeyError: 'servertime'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "WeiboSuperCommentScrapy.py", line 399, in <module>
WeiboLogin(username, password, cookie_path).login()
File "WeiboSuperCommentScrapy.py", line 227, in login
sever_data = self.pre_login()
File "WeiboSuperCommentScrapy.py", line 186, in pre_login
servertime = sever_data["servertime"]
KeyError: 'servertime'
感觉是因为微博换了登录方式导致的登录不进去....
另外如果能爬多条微博的评论那就最好了，建议可以加个文件读取什么的，可以爬取多条微博的全部评论
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
json.loads() 读取错误
weibo_comment.py的104行
max_id_json = html.xpath('//div[@node-type="comment_loading"]/@action-data')[0]
在爬到第21页时报错：IndexError: list index out of range
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