"Type error: unhashable type: 'list'" in Praw bot

Question

运行 Reddit 机器人的以下代码给出了代码下方列出的错误消息，谁能帮我解决这个错误？我已经尝试了几件事，但无法在 Google 上找到答案。提前致谢。 D_035

#Bot

import praw
import time
import re
import os

r = praw.Reddit(user_agent = "Bot")
r.login()
cache = []



def run_bot():
    subreddit = r.get_subreddit("broap")
    comments = subreddit.get_comments(limit=25)
    for comment in comments:
        comment_text = comment.body.lower()
        author = comment.author
        url = comment.link_id
        msg = "User {} has tagged you in a post!".format(author)
        words = filter( lambda x:x.startswith('//'), comment_text.split())
        user = words[2:]  
        if comment.id not in cache and words:
            r.user.send_message(user ,msg)
            cache.add(comment.id)




while True:
    run_bot()
    time.sleep(5)

它在运行之后给出的错误消息：

raceback (most recent call last):
  File "Test.py", line 32, in <module>
    run_bot()
  File "Test.py", line 25, in run_bot
    r.user.send_message(user ,msg)
  File "/usr/local/lib/python2.7/dist-packages/praw/decorators.py", line 60, in wrapped
    return function(self.reddit_session, self, *args, **kwargs)
  File "<decorator-gen-144>", line 2, in send_message
  File "/usr/local/lib/python2.7/dist-packages/praw/decorators.py", line 271, in wrap
    return function(*args, **kwargs)
  File "<decorator-gen-143>", line 2, in send_message
  File "/usr/local/lib/python2.7/dist-packages/praw/decorators.py", line 177, in require_captcha
    return function(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/praw/__init__.py", line 2555, in send_message
    retry_on_error=False)
  File "<decorator-gen-8>", line 2, in request_json
  File "/usr/local/lib/python2.7/dist-packages/praw/decorators.py", line 116, in raise_api_exceptions
    return_value = function(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/praw/__init__.py", line 620, in request_json
    retry_on_error=retry_on_error)
  File "/usr/local/lib/python2.7/dist-packages/praw/__init__.py", line 451, in _request
    response = handle_redirect()
  File "/usr/local/lib/python2.7/dist-packages/praw/__init__.py", line 432, in handle_redirect
    verify=self.http.validate_certs, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/praw/handlers.py", line 137, in wrapped
    if _cache_key in cls.cache:
TypeError: unhashable type: 'list'

Answer 1

r.user.send_message() 不期望列表作为第一个参数。从文档来看，它似乎需要一个字符串（类似于用户名）。

你的构建方式user：

    words = filter( lambda x:x.startswith('//'), comment_text.split())
    user = words[2:]

使它成为一个列表（过滤器 returns 一个可迭代的，然后 [2:] returns 这个可迭代的 "portion" ； 'source' 是一个列表（ split() 的输出），它 returns 一个列表），因此出现错误。

为了更正您的功能，您必须更改构建方式 user。不知道你到底想做什么，不知道怎么帮你。

编辑：现在你说的再多一点，我就这样吧:

def run_bot():
    subreddit = r.get_subreddit("broap")
    comments = subreddit.get_comments(limit=25)
    for comment in comments:
        comment_text = comment.body.lower()
        author = comment.author
        url = comment.link_id
        words = filter( lambda x:x.startswith('//'), comment_text.split())
        users_list = [ w[2:] for w in words ]
        for u in users_list:
            if comment.id not in cache and words:
                r.user.send_message(u, 
        "User {a} has tagged you in a post!".format(a=author))
                cache.append(comment.id)

这应该处理在评论中找到的任何//用户名。（你怎么确定用户名确实存在？这不是问题吗？（例如，如果我写 "A dummy comment just to try //invalid_username"，会发生什么？））

其他：这与您的问题没有直接关系，但是这一行：

    if comment.id not in cache and words:

可能不会做你想做的事（只有当 comment.id 不在缓存中并且 words 不是空列表 时才会为真，它不会检查如果 comment.id 属于单词）。

"Type error: unhashable type: 'list'" in Praw bot

"Type error: unhashable type: 'list'" in Praw bot

python-3.x

praw