Merge pull request #442 from alibaba-damo-academy/dev_lhn

hnluo

2023-04-28 ebabb37754d184ba30ba2f016f44e5f82138c3c3

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)