On 07Jan2016 16:12, Python-Dev <python-dev@python.org> wrote:
On Jan 7, 2016, at 15:57, Martin Panter <vadmium...@gmail.com> wrote:
On 7 January 2016 at 22:26, Blake Griffith <blake.a.griff...@gmail.com> wrote:
I'm interested in adding the functionality to do something like:
b'a' ^ b'b'
b'\x03'
Instead of the good ol' TypeError.
I think both bytes and bytearray should support all the bitwise operations.
There is a bug open about adding this kind of functionality:
<https://bugs.python.org/issue19251>.
And it's in the needs patch stage, which makes it perfect for the OP: in
addition to learning how to hack on builtin types, he can also learn the other
parts of the dev process. (Even if the bug is eventually rejected, as seems
likely given that it sat around for three years with no compelling use case
and then Guido added a "very skeptical" comment.)
The use case which springs immediately to my mind is cryptography. To encrypt a
stream symmetrically you can go:
cleartext-bytes ^ cryptographicly-random-bytes-from-cipher
so with this one could write:
def crypted(byteses, crypto_source):
''' Accept an iterable source of bytes objects and a preprimed source of
crypto bytes, yield encrypted versions of the bytes objects.
'''
for bs in byteses:
cbs = crypto_source.next_bytes(len(bs))
yield bs ^ cbs
Cheers,
Cameron Simpson <c...@zip.com.au>
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