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>>> from .pycompat import bytechr as chr
>>> d = {b'nl': chr(10), b'bs': chr(92), b'cr': chr(13), b'nul': chr(0)}
>>> s = b"ab%(nl)scd%(bs)s%(bs)sn%(nul)s12ab%(cr)scd%(bs)s%(nl)s" % d
>>> s
'ab\ncd\\\\n\x0012ab\rcd\\\n'
>>> res = _string_escape(s)
>>> s == _string_unescape(res)
True
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