Dev gzf exp (#1650)

zhifu gao

2024-04-23 61d631fb5b8e3154d824fe50f697b0303a2f73f3

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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)