[issue25270] codecs.escape_encode systemerror on empty byte string

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

On 01.10.2015 04:35, Martin Panter wrote:
> For the record, because I was curious: Function codecs.escape_encode() is not documented, and barely tested. It was used for the documented “string_escape” codec in Python 2, but this codec was removed for Python 3 in revision bc90fc9b70b7. The function was apparently added to support pickling, but I don’t see any evidence that it was ever used. Only the decode counterpart was used. I wonder if the encode function could be removed at some point.

It's a codec, so either we remove both functions or leave both
functions in. It's still used in pickletools and serves a useful
purpose there (to unescape embedded escapes in byte streams).

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