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brettcannon /
Created May 8, 2019
Parse a wheel filename using packaging.tags
import packaging.tags
def parse_wheel_filename(path):
name = os.path.splitext(_compat.fspath(path))[0]
index = len(name)
for _ in range(3): # interpreter, ABI, platform.
index = name.rindex("-", 0, index)
return packaging.tags.parse_tag(name[index + 1 :])
brettcannon / cloudSettings
Last active Jun 18, 2018
Visual Studio Code Settings Sync Gist
View cloudSettings
brettcannon /
Last active Mar 9, 2018
Parse the Pylint message list
import pathlib
import re
SUMMARY_LINE_RE = re.compile(r':(?P<name>\S+) \((?P<code>.+?)\):( \*(?P<summary>.+)\*)?')
def parse_summary_line(line):
line_match = SUMMARY_LINE_RE.match(line)
if not line_match:
raise ValueError(f"ill-formed line: {line!r}")
brettcannon /
Last active Nov 28, 2017
# Lookup a revision hash in a bunch of different hgwebdir repos.
# Also includes special treatment for subversion revisions from
# the CPython repo.
# Written by Georg Brandl, 2010.
import io
import json
brettcannon / 3.5-comparison.txt
Created Sep 13, 2016
Performance comparison between Python 3.5.2+ & 3.6b1+
View 3.5-comparison.txt
| Benchmark | 3.5-perf.json | 3.6-perf.json | Change | Significance |
| 2to3 | 0.68 | 0.62 | 1.09x faster | Significant (t=65.03) |
| call_method | 0.02 | 0.02 | 1.07x faster | Significant (t=46.01) |
| call_method_slots | 0.02 | 0.02 | 1.06x faster | Significant (t=29.45) |
| call_method_un
brettcannon /
Created Apr 13, 2016
Possibly implementations of os.fspath()
# str-only.
def fspath(path):
path = path.__fspath__()
except AttributeError:
if isinstance(path, str):
return path
raise TypeError
View An unscientific survey of Python interpreters.ipynb
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View Porting Python 2 code to Python 3.ipynb
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brettcannon / gist:a9c9a5989dc383ed73b4
Last active Sep 19, 2017
Initial email about Python development process and proposed improvements
View gist:a9c9a5989dc383ed73b4

This was posted as an email to python-dev.

History lesson

Since I signed up for the python-dev mailing list way back in June 2002, there seems to be a cycle where we as a group come to a realization that our current software development process has not kept up with modern practices and could stand for an update. For me this was first shown when we moved from SourceForge to our own infrastructure, then again when we moved from Subversion to Mercurial (I led both of these initiatives, so it's somewhat a tradition/curse I find myself in this position yet again). And so we again find ourselves at the point of realizing that we are not keeping up with current practices and thus need to evaluate how we can improve our situation.

Where we are now

Now it should be realized that we have to sets of users of our development process: contributors and core developers (the latter whom can play both roles). If you take a rough outline of our cur


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