Python 中文字符串的截取

def subString(s, length):
us = unicode(s, 'utf-8')
gs = us.encode('gb2312')
n = int(length)
t = gs[:n]
while True:
try:
unicode(t, 'gbk')
break
except:
n -= 1
t = gs[:n]
return t.decode('gb2312')

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