Serhiy Storchaka added the comment:
Here is a patch for 3.4 based on Matt's patch with additional optimizations. It
speeds up body_encode() and header_encode().
$ ./python -m timeit -s "from email.quoprimime import body_encode as encode; x
= open('Lib/decimal.py').read()[:100000]" "encode(x)"
Before patch: 1.12 sec per loop
After patch: 26.3 msec per loop
$ ./python -m timeit -s "from email.quoprimime import header_encode as encode;
x = b'A'*100" "encode(x)"
Before patch: 97.9 usec per loop
After patch: 23.7 usec per loop
For non-ascii data difference is even larger.
----------
stage: needs patch -> patch review
Added file: http://bugs.python.org/file30249/email_quoprimime_fast_encode.patch
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