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Simplifying things for fun and profit.

Vincent Driessen nvie

Simplifying things for fun and profit.
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nvie /
Created Sep 13, 2019
Fish completion for codegen
# Put the following in your ~/.config/fish/completions directory
complete --command codegen --no-files --arguments "(codegen -l)"
View .gitmodules
[submodule "vim/bundle/vim-characterize"]
path = vim/pack/nvie/start/vim-characterize
url =
# Define types of building blocks
SUBDOMAIN = STRING.set('validate', validate_subdomain)
'data': NESTED({
'attributes': NESTED({
'subdomain': SUBDOMAIN,

Here's my config:

$ cat Procfile.test
foo: python -u

$ cat
import logging
logging.warn('A log line\nWith a line break')
logging.warn('Second log')
def lookup_table(values, key=None, keyval=None, unique=False, use_lists=False):
Builds a dict-based lookup table (index) elegantly.
Supports building normal and unique lookup tables. For example:
>>> lookup_table(['foo', 'bar', 'baz', 'qux', 'quux'],
... lambda s: s[0])
'b': {'bar', 'baz'},
'f': {'foo'},
'q': {'quux', 'qux'}
nvie / magic.awk
Last active Aug 29, 2015
Different highlights of this piece of code that is valid C, C++, awk, perl, Python, sh, bash and tcl:
View magic.awk
#ifdef _not_defined
"exit`[ -z $BASH ] && t=sh; [ -z $BASH ] || t=$(basename $BASH); echo Hello, World from $t > /dev/tty;`";
"[puts {Hello, World from Tcl}; {exit}]";
from operator import concat;
exec concat(concat(concat(chr(109),chr(61)),chr(39)),chr(39));
m,""" ";/,;s/;//;
#include <stdio.h>
#define BEGIN int main(int nargs,char** args)

Keybase proof

I hereby claim:

  • I am nvie on github.
  • I am nvie ( on keybase.
  • I have a public key whose fingerprint is 9B5C 55F6 2651 625C C4EE 7C8F 4DAB 9440 5EA5 AAF0

To claim this, I am signing this object:

nvie /
Created Nov 29, 2013
Really useful helper that I use constantly to force myself to write more efficient Django queries.
from contextlib import contextmanager
from django.conf import settings
from django.db import connection
def no_queries_allowed():
"""This is a helper method that makes it easier during development, by
throwing an exception when any queries are made within its block. Using
nvie /
Last active Dec 18, 2015
The sift itertool.
from collections import deque
from functools import wraps
def inversify(predicate):
"""Returns a predicate that is the inverses of the given predicate."""
def _inner(*args, **kwargs):
return not predicate(*args, **kwargs)
return _inner
nvie /
Created Mar 7, 2013
What's the best place to put this code? This is basically setup code that you want to execute on Django's boot time. I'm currently putting it in an arbitrary app's, but that feels a bit lame. Ideas? Settings seems like a bad idea, too.
import jingo
from django_assets.env import get_env
jingo.env.assets_environment = get_env()
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