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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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