Revert "Revert "Dev yf" (#1418)" (#1420)

zhifu gao

2024-03-04 cae52c52f3d322b39346e7b784b839ef995bffcb

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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)