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行的一个拼写错误：
我正试图编写一段代码，将ID添加到集合中，这样我就可以查看它是否已经被使用，并将集合存储在一个文件中。我一直试图通过使用Shelve模块来实现这一点，但遇到了一些麻烦。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()
files[already_done] = already_done
我想你希望它是
files["already_done"] = already_done
错误在以下行：
files[already_done] = already_done
python中的list是可变的。可变类型不能用作字典中的键。在执行files[already_done] = already_done之前，将列表already_done转换为元组，它将正常工作。
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，如果您只是希望密钥是字符串"already_done"，而不是列表already_done，则应该执行以下操作：
files['already_done'] = already_done