Merge pull request #66 from alibaba-damo-academy/dev_lzr

hnluo

2023-02-06 c6360e9fe17727b60774867347257b5349a798d8

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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)