Merge pull request #199 from alibaba-damo-academy/dev_xw

zhifu gao

2023-03-16 d783b24ba7d8a03dabfa2139fcbf40c216e0ea3d

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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)