https://wikiprogramming.alfredgg.dev/ 2026-05-13T10:15:43+0000 https://wikiprogramming.alfredgg.dev/ https://wikiprogramming.alfredgg.dev/lib/tpl/dokuwiki/images/favicon.ico text/html 2021-09-12T14:16:04+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:basic&rev=1631456164&do=diff Python basic recipes Base lib dicts pop >>> a = {'a': 1, 'b': 2} >>> a.pop('a') 1 >>> a {'b': 2} >>> a.pop('a') Traceback (most recent call last): File "<stdin>", line 1, in <module> KeyError: 'a' >>> a.pop('a', 0) 0 Custom parameters in logging text/html 2021-02-08T18:44:26+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:basic_django&rev=1612809866&do=diff Django Commands to manage the project To know the version: python -m django --version Create a Django project: django-admin startproject mysite . Launch project: manage.py runserver Create app: python manage.py startapp polls Create app in a different folder than root which should exist: text/html 2020-06-20T10:02:54+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:code_notes&rev=1592647374&do=diff Python snippets Getters & setters import flask class MyFlask(flask.Flask): @property def static_folder(self): if self.config.get('STATIC_FOLDER') is not None: return os.path.join(self.root_path, self.config.get('STATIC_FOLDER')) @static_folder.setter def static_folder(self, value): self.config.get('STATIC_FOLDER') = value text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:fabtools&rev=1589016310&do=diff Fabtools * <https://fabtools.readthedocs.org/> It is a library that allow to install and configure applications on remote hosts. For instance next script install a PostgreSQL, a postfix, an Nginx... from fabric.api import * from fabtools import require import fabtools @task def setup(): # Require some Debian/Ubuntu packages require.deb.packages([ 'imagemagick', 'libxml2-dev', ]) # Require a Python package with fabtools.python.virtualenv('/home/myuser/… text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:flake8&rev=1589016310&do=diff Flake8 Basic usage Documentation: * <http://flake8.pycqa.org/en/latest/> Install: pip install flake8 To use it for a folder: # for the current path flake8 # or python -m flake8 # or flake8 /the/path To use it for a file: flake8 path/to/file.py The output format is: text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:flask&rev=1589016310&do=diff Flask Extensions * Flask SQLAlchemy * Flask RESTful * Flask MongoAlchemy * Flask Mongo Engine * Flask Login * Flask Testing * Flask used libraries Some elements Configuration There are several ways to set configuration: app = Flask(__name__) # Using app.config app.config['DEBUG'] = True # Just debug (and few more) allow to configure like this: app.debug = True # Updating multiple app.config.update( DEBUG=True, SECRET_KEY='...' ) # From a file app.config.from_object('… text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:jinja2&rev=1589016310&do=diff Jinja2 from jinja2 import Template template = Template('Hello {{ name }}!') template.render(name='John Doe') JINJA2_GLOBALS = { 'now': datetime.datetime.now } app.jinja_env.globals.update(**JINJA2_GLOBALS) text/html 2021-04-24T11:21:56+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:libraries&rev=1619263316&do=diff Python libraries Big ones Little ones * Colorama mostrar el texto con diferentes fondos y colores de una forma muy sencilla. * PySnooper para hacer prints en medio de una función. IPython * object?? * object? * %quickref o %magic * %run -i hello.py, run interactively hello.py text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:medium_django&rev=1589016310&do=diff Django Gotchas Django hows Cómo tener varios setting files Símplemente has de definir una variable de entorno denominada DJANGO_SETTINGS_MODULE e indicar la ruta del módulo de settings deseado: DJANGO_SETTINGS_MODULE = coopolis_backoffice.settings.alfred text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:mongoengine&rev=1589016310&do=diff MongoEngine Updates Masive update: GameServer.objects(ip=ip).update(set__status=Server_status.STATUS_RUNNING) Queries Nested fileds You can use the double underscore: Tournament.objects.filter(type__num_players=2) Or raw queries: Tournament.objects.filter(__raw__={'type.num_players': 2}) TournamentConfig.objects.filter(__raw__={'$where': 'this.type.num_players * this.type.num_teams == 4'}) text/html 2022-01-15T08:41:24+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:notes&rev=1642236084&do=diff Python notes Time zones The best practice is to store the datetime in the DB as UTC. To use time-zone-aware datetime objects internally, and to translate them to the end user’s time zone. It avoids the problem with Daylight Saving Time (DST), the zones where the clock is moved in spring and autumn. text/html 2020-05-09T09:25:10+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:pymongo&rev=1589016310&do=diff Pymongo Connect and DB select from pymongo import MongoClient client = MongoClient('54.77.11.158', 27017) db = client.electronic Query db.cms_article.find() Query one db.cms_category.find_one({'id': art[_id]}) Update db.cms_article.update( {'_id': art['_id']}, art, upsert=False, multi=False) text/html 2020-12-02T13:52:48+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:sqlalchemy&rev=1606917168&do=diff SqlAlchemy Sessions Add\attach to session: session.add(object) Dettach to session: session.expunge(object) text/html 2022-10-28T19:14:44+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:tooling&rev=1666984484&do=diff Python Tooling PyEnv For managing python environments. First of all install libraries for properly compile any Python version: sudo apt-get install -y make build-essential libssl-dev zlib1g-dev \ libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev \ libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python3-openssl text/html 2022-10-12T19:03:00+0000 Anonymous (anonymous@undisclosed.example.com) https://wikiprogramming.alfredgg.dev/doku.php?id=wiki2:python:typing&rev=1665601380&do=diff Python Typing Devolver el tipo de la misma clase: from typing import Self class Foo: def returns_self(self) -> Self: return self Alias de tipo: from typing import TypeAlias Factors: TypeAlias = list[int] Definición de un tipo (en este caso self):