Use PEP 393 new APIs

[methane]

markupsafe doesn't support Python 3.2 anymore.
So just use new API at Python 3.

[ThiefMaster]

Small recommendation: Don't mix commits changing just whitespace with other commits

[methane]

Python 3.6.5

before:

================================================================================
Running benchmark for MarkupSafe
--------------------------------------------------------------------------------
basic                           200000 loops, best of 5: 1.91 usec per loop
largestring                     2000 loops, best of 5: 199 usec per loop
long_empty_string               20000 loops, best of 5: 15.9 usec per loop
long_suffix                     1000 loops, best of 5: 386 usec per loop
short_empty_string              200000 loops, best of 5: 1.66 usec per loop
--------------------------------------------------------------------------------

patched:

================================================================================
Running benchmark for MarkupSafe
--------------------------------------------------------------------------------
basic                           200000 loops, best of 5: 1.34 usec per loop
largestring                     2000 loops, best of 5: 111 usec per loop
long_empty_string               20000 loops, best of 5: 10.2 usec per loop
long_suffix                     1000 loops, best of 5: 234 usec per loop
short_empty_string              200000 loops, best of 5: 1.21 usec per loop
--------------------------------------------------------------------------------

[davidism]

We no longer support 2.6 and 3.3 either. Would that affect this code (probably make it simpler)?

[methane]

I don't think so.

On the other hand, I can remove Python 2 specific code and share same logic (GET_DELAT and DO_ESCAPE macro).

[davidism]

@methane I'm not very familiar with C / the C-API. If you have some time, would you mind checking #74 just so I know it makes sense?

[methane]

Python 2.7.13

before:
================================================================================
Running benchmark for MarkupSafe
--------------------------------------------------------------------------------
basic                           1000000 loops, best of 3: 1.79 usec per loop
largestring                     1000 loops, best of 3: 261 usec per loop
long_empty_string               10000 loops, best of 3: 42.7 usec per loop
long_suffix                     1000 loops, best of 3: 630 usec per loop
short_empty_string              1000000 loops, best of 3: 1.68 usec per loop
--------------------------------------------------------------------------------

after:
================================================================================
Running benchmark for MarkupSafe
--------------------------------------------------------------------------------
basic                           1000000 loops, best of 3: 1.79 usec per loop
largestring                     1000 loops, best of 3: 286 usec per loop
long_empty_string               10000 loops, best of 3: 38.4 usec per loop
long_suffix                     1000 loops, best of 3: 726 usec per loop
short_empty_string              1000000 loops, best of 3: 1.46 usec per loop
--------------------------------------------------------------------------------

Hmm, 379d0d0 makes escaping little slower on PY2.7.

[davidism]

I'm fine with reverting it if it makes it faster.

[methane]

I removed last commit.
We can remove PY2 only code after PY2 EOL anyway. So keeping some PY2 only code for few years is not big problem.

[ThiefMaster]

We can remove PY2 only code after PY2 EOL anyway

More like "only after EOL being dropped by all major distributions, and not being relevant anymore" ;)

[methane]

"after" didn't mean "right after".
I don't care when you drop PY2 support.

(FYI, Django 2.0 has significant performance gain from dropping PY2 support. 😉 )

[davidism]

Rebased to master. Converted to pytest.

[davidism]

Thanks for working on this!