Python：UTF-8 问题（再次......）
我有一个数据库，每天两次与外部网络源同步。该网络源包含一堆条目，其中包含名称以及有关这些名称的一些额外信息。
其中一些名称很愚蠢，我想在将它们插入我自己的数据库时重命名它们。为了重命名这些愚蠢的名称，我有一个标准字典：
RENAME_TABLE = { "Wσird" : "Weird", ... }
如您所见，这就是 UTF-8 发挥作用的地方。这是对所有有问题的条目执行重命名的函数：
def rename_all_entries():
all_keys = RENAME_TABLE.keys()
entries = Entry.objects.filter(name__in=all_keys)
for entry in entries:
entry.name = RENAME_TABLE[entry.name]
entry.save()
因此它尝试在 RENAME_TABLE 中查找旧名称，并在找到时重命名该条目。但是，在使用 RENAME_TABLE[entry.name] 时出现 KeyError 异常。
现在我迷失了，我该怎么办？我...
# -*- coding: utf-8 -*-
...在Python 文件的顶部。
I have a database which is synchronized against an external web source twice a day. This web source contains a bunch of entries, which have names and some extra information about these names.
Some of these names are silly and I want to rename them when inserting them into my own database. To rename these silly names, I have a standard dictionary as such:
RENAME_TABLE = { "Wσird" : "Weird", ... }
As you can see, this is where UTF-8 comes into play. This is the function which performs renaming of all the problematic entries:
def rename_all_entries():
all_keys = RENAME_TABLE.keys()
entries = Entry.objects.filter(name__in=all_keys)
for entry in entries:
entry.name = RENAME_TABLE[entry.name]
entry.save()
So it tries to find the old name in RENAME_TABLE and renames the entry if found. However, I get a KeyError exception when using RENAME_TABLE[entry.name].
Now I'm lost, what do I do? I have...
# -*- coding: utf-8 -*-
...in the top of the Python file.
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评论（1）
您收到的错误是由于您希望字典中不存在 unicode 字符串。回想一下，在 Python 2.x 中（我假设您正在使用它），默认字符串类型是 8 位，而不是 unicode，因此您实际上是使用 8 位字符串对字典进行键控。要声明 unicode 字符串，请使用 u"my unicode string"。那么它应该被接受为密钥。
The error you are receiving is due to the unicode string you want not being in the dictionary. Recall that in Python 2.x (I assume you are using that), the default string type is 8-bit, not unicode, so you are actually keying the dictionary with 8-bit strings. To declare a unicode string, use u"my unicode string". Then it should be accepted as a key.