Update SDK_advanced_guide_online_zh.md

Yabin Li

2023-08-16 53624c8abcc0638fad602cc7e70b9f47e7697154

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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)