Update SDK_advanced_guide_offline_zh.md

Yabin Li

2023-08-16 b8f9a75514fed27da73b23bdbaa9452424b6e352

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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)