Update SDK_advanced_guide_online.md

Yabin Li

2023-08-16 a657238ad362142cb5b56c47c26cf294884693a8

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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)