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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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