Merge pull request #540 from alibaba-damo-academy/dev-zc

Chong Zhang

2023-05-23 897847cb66a88c6e2728a89897b453c16388046f

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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)