Merge pull request #40 from alibaba-damo-academy/dev

zhifu gao

2023-01-18 2a629b3d61fa0ea9a30bcdd49f8cbd07154e47b4

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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)