我相信编解码器模块提供了此实用程序：

I believe that the codecs module provides this utility:

>>> import codecs
>>> codecs.decode("1+1\\u003d2", encoding='unicode_escape')
'1+1=2'

这可能是一个更大的问题。这些字符串如何排在首位？

This probably points to a larger problem, though. How do these strings come to be in the first place?

注意，如果这是从有效的JSON字符串中提取的（在这种情况下，它将丢失引号） ，您可以简单地使用：

Note, if this is being extracted from a valid JSON string (in this case it would be missing the quotes), you could simply use:

>>> import json
>>> json.loads('"1+1\\u003d2"')
'1+1=2'