update demo, readme

shixian.shi

2024-01-16 b7cb19b01a1454f7a1388e24dcd4e10fc654bd7c

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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)