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我正在尝试编写一段代码，将 ID 添加到集合中，以便我可以查看它是否已被使用，并将集合存储在文件中。我一直在尝试通过使用 Shelve 模块来做到这一点，但我遇到了一些麻烦。到目前为止我有这个代码

import praw
import datetime
import shelve

user_agent ='Removed'
r = praw.Reddit(user_agent=user_agent)
submission = r.get_submission(submission_id='11v36o')
r.login('Removed','Removed')
files = shelve.open("PrawTest3.dat", writeback=True)
print "Opened!"
already_done = {} 
files["already_done"] = ["a","b"]
files.close()
done = set()
print "Running"

while True:
    subreddit = r.get_subreddit('mobilebot')
    all_comments = subreddit.get_comments()
    files = shelve.open("PrawTest2.dat", writeback=True)
    already_done = files["already_done"]
    files.close()
    for comment in all_comments:
        if (comment.body == "Hello") and (comment.id not in already_done) and (comment.id not in done):

            files = shelve.open("PrawTest2.dat", writeback=True)
            comment.reply(' world!')
            already_done = files["already_done"]
            already_done.append(comment.id)

            files[already_done] = already_done
            print "Shelves working"
            a = datetime.datetime.now()
            b = "%s:%s:%s" % (a.hour,a.minute, a.second)
            print "["+b+"]"+"Comment sent!"
            files.sync()
            files.close()
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2 回答 2

1

Python 的列表不能用作搁置或 dic 的键，因为它没有哈希值。但我认为你的问题只是这一行的一个错字：

files[already_done] = already_done

我想你希望它是

files["already_done"] = already_done
于 2014-04-13T22:30:36.693 回答
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错误在该行中：

files[already_done] = already_done

list在 python 中是可变的。可变类型不能用作字典中的键。在执行之前将您的列表转换already_done为元组files[already_done] = already_done，它会正常工作。

这就是我的意思：

>>> a_dict = {}
>>> a_list = [1, 2, 3]
>>> a_dict[a_list] = "Hello"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'


>>> a_tuple = tuple(a_list)
>>> a_dict[a_tuple] = "Hello"
>>> a_dict
{(1, 2, 3): 'Hello'}

但是，如果您只是希望 key 是字符串 "already_done" 而不是 list already_done，您应该这样做：

files['already_done'] = already_done

于 2014-04-13T22:28:54.217 回答