Update iterable_dataset.py

hnluo

2023-03-10 1eacb8ae811a7e68c296523e6a8b4e72eb024aa2

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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)