unicode 아닌 문자를 unicode로

[출처 : http://bbs.python.or.kr/viewtopic.php?p=66561&sid=d7caa9e552c40cae5c64bd0169a5d73a]

>>> a = "\uc5ec\ub7ec" 
>>> a.decode('unicode-escape') 
u'\uc5ec\ub7ec' 
>>> print a.decode('unicode-escape') 
여러 



>>> import re 
>>> re.sub(r'\\u(\w+)', lambda m: unichr(int(m.group(1), 16)), a) 
u'\uc5ec\ub7ec' 
>>> print _ 
여러