hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

staltz

import os

ENV_VARS_FILENAME = '.env'

def import_env_vars(project_root):
	"""Imports some environment variables from a special .env file in the
	project root directory.

	"""
	if len(project_root) > 0 and project_root[-1] != '/':

webframp

Probably one of the easiest things you'll ever do with gpg

Install Keybase: https://keybase.io/download and Ensure the keybase cli is in your PATH

First get the public key

keybase pgp export | gpg --import

Next get the private key

PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements

amatellanes

/* Useful celery config.

app = Celery('tasks',
             broker='redis://localhost:6379',
             backend='redis://localhost:6379')

app.conf.update(
    CELERY_TASK_RESULT_EXPIRES=3600,
    CELERY_QUEUES=(
        Queue('default', routing_key='tasks.#'),

shymonk

Customize Save In Django Admin Inline Form

Background

This is a common case in django ORM.

from django.db import models

class Author(models.Model):

syxanash

Pizza Recipe

Hi I'm Simone! This recipe was developed based on some tips I acquired over time from lots and lots of resources and tutorials like youtube videos, family and friends recipes. I'm just an amateur who likes making pizza :)

If you plan to perfectionate your pizza making skills, I suggest to come up with your own recipe and research online watching lots of tutorials and different techniques. For now the following recipe is the one that works for me!

(I'm not a professional pizzaiolo and I never had any sort of experience in a professional pizzeria restaurant)

Ingredients and quantities

isaacs

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

abrookins

from django.db import models

# Assuming this model.

class Example(models.Model):
    image = models.ImageField(upload_to="somewhere/special")


# You want to set this field to point to an existing image (in a script, or a view, etc.).
example = Example.objects.get(id=1)

eerien

from django import forms
from django.core import validators
from django.core.exceptions import ValidationError

class MinLengthValidator(validators.MinLengthValidator):
    message = 'Ensure this value has at least %(limit_value)d elements (it has %(show_value)d).'

class MaxLengthValidator(validators.MaxLengthValidator):
    message = 'Ensure this value has at most %(limit_value)d elements (it has %(show_value)d).'