matuu

#!/bin/bash

sudo apt-get -y install language-pack-es-base 
sudo apt-get -y install postgresql-9.1 libpq-dev postgresql-9.1-postgis gdal-bin
sudo apt-get -y install git python-pip python-dev
sudo apt-get -y install libxml2-dev libxslt1-dev
sudo -u postgres psql -c "CREATE ROLE dev LOGIN PASSWORD 'dev' SUPERUSER VALID UNTIL 'infinity';"
sudo -u postgres createdb template_postgis
sudo -u postgres psql -d template_postgis -f /usr/share/postgresql/9.1/contrib/postgis-1.5/postgis.sql
sudo -u postgres psql -d template_postgis -f /usr/share/postgresql/9.1/contrib/postgis-1.5/spatial_ref_sys.sql

matuu

@register.assignment_tag
def query(qs, **kwargs):
    """ template tag which allows queryset filtering.
    Usage:
        {% load query from operations %}
        {% query operations description="some things" as records %}
        {% for r in records %}
        ...
        {% endfor %}
    """

matuu

$ git commit ...              (1)
$ git reset --soft "HEAD^"    (2)
$ edit                        (3)
$ git add ....                (4)
$ git commit -c ORIG_HEAD     (5)

1)    This is what you want to undo
2)    This is most often done when you remembered what you just committed is incomplete, or you misspelled your commit message, or both. Leaves working tree as it was before "reset". (The quotes are required if you use zsh)
3)    Make corrections to working tree files.
4)    Stage changes for commit.

matuu

def luhn_checksum(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd_digits = digits[-1::-2]
    even_digits = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
    for d in even_digits:
        checksum += sum(digits_of(d*2))