jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

dnfehren

#get rid of anything from a mis-installed version
sudo apt-get --purge remove postgres*
sudo rm -rf /var/lib/postgresql
sudo deluser -remove-all-files postgres

#install the packages
sudo apt-get install postgresql-9.1
sudo apt-get install pgadmin3 phppgadmin

#shutdown postgres database server

postrational

#!/bin/bash

NAME="hello_app"                                  # Name of the application
DJANGODIR=/webapps/hello_django/hello             # Django project directory
SOCKFILE=/webapps/hello_django/run/gunicorn.sock  # we will communicte using this unix socket
USER=hello                                        # the user to run as
GROUP=webapps                                     # the group to run as
NUM_WORKERS=3                                     # how many worker processes should Gunicorn spawn
DJANGO_SETTINGS_MODULE=hello.settings             # which settings file should Django use
DJANGO_WSGI_MODULE=hello.wsgi                     # WSGI module name

sloria

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

hest

def get_count(q):
    count_q = q.statement.with_only_columns([func.count()]).order_by(None)
    count = q.session.execute(count_q).scalar()
    return count

q = session.query(TestModel).filter(...).order_by(...)

# Slow: SELECT COUNT(*) FROM (SELECT ... FROM TestModel WHERE ...) ...
print q.count()

singingwolfboy

# Want to run your Flask tests with CSRF protections turned on, to make sure
# that CSRF works properly in production as well? Here's an excellent way
# to do it!

# First some imports. I'm assuming you're using Flask-WTF for CSRF protection.
import flask
from flask.testing import FlaskClient as BaseFlaskClient
from flask_wtf.csrf import generate_csrf

# Flask's assumptions about an incoming request don't quite match up with

kuznero

Cleanup docker images and containers after failed builds

Sometimes, there are some untagged images left behind after failed builds. In order to get rid of those, this script can be used.

#!/bin/bash
docker rm $(docker ps -aq)
docker rmi $(docker images | grep "^<none>" | awk '{print $3}')

kozo2

doaa-altarawy

# For more configuration details:
# https://docs.codecov.io/docs/codecov-yaml

# Check if this file is valid by running in bash:
# curl -X POST --data-binary @.codecov.yml https://codecov.io/validate

# Coverage configuration
# ----------------------
coverage:
  status:

doaa-altarawy

language: python

# turn off sudo
sudo: false

# python versions to be tested
matrix:
  include:
    - python: 2.7
    - python: 3.5