Merge pull request #671 from alibaba-damo-academy/dev_lhn

hnluo

2023-06-27 a19c9e5c805d727d2d0a81053997d70e3326e3cb

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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)