arthuralvim

import queue
import threading

num_worker_threads = 1


def do_work(item):
    print(item)

arthuralvim

from django import template
from django.contrib.auth.models import Group

register = template.Library()

@register.filter(name='has_group')
def has_group(user, group_name):
    group = Group.objects.get(name=group_name)
    return True if group in user.groups.all() else False

arthuralvim

from django.db.models import OuterRef

weapons = Weapon.objects.filter(unit__player_id=OuterRef('id'))
units = Unit.objects.filter(player_id=OuterRef('id'))

qs = Player.objects.annotate(weapon_count=SubqueryCount(weapons),
                             rarity_sum=SubquerySum(units, 'rarity'))

arthuralvim

cd /path/to/files &&
for file in *.mp3 *.mp4; do
    if [[ -f "$file" ]]; then
        if [[ -f "${file}.md5" ]]; then
        echo "already exists: ${file}.md5"
        else
            md5sum -- "$file" > "${file}.md5";
            cat "${file}.md5";
        fi
    fi

arthuralvim

PGP Summary

Installation with Brew

$ brew install gnupg

List Keys

arthuralvim

# So... I took that as a challenge and displayed all dates that sums 68 from 1900 to 2088 (when I'm going to make 100 years).
# Be safe and avoid those dates. =P

from datetime import date
from datetime import timedelta

def sum_date(date):
    date_str = date.strftime('%d %m %Y')
    date_str = date_str[:8] + ' ' + date_str[8:]
    return sum(map(int, date_str.split()))

arthuralvim

First steps with the Luigi workflow manager

As an introduction into Luigi, I am following this tutorial with some modifications, e.g. installation using conda.

The problems and solutions described in the examples below have led to the development of sciluigi,

arthuralvim

# -*- coding: utf-8 -*-

# requirements
# pip install unipath
# pip install python-decouple

from os.path import join
from unipath import Path
from decouple import config
import csv

arthuralvim

from sqlalchemy import create_engine
from sqlalchemy.orm import Session
from myapp.models import BaseModel
import pytest


@pytest.fixture(scope="session")
def engine():
    return create_engine("postgresql://localhost/test_database")

arthuralvim

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...