Update README.md

yhliang

2023-04-16 b8c9216d1422d6a19c7b02953a6a5b5a88be84a7

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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)