codesnips

python

python 
import random


class ReadWriteRouter:
    """Route reads to replicas, writes to primary."""

Django database read-write split with routers

django python database
by Priya Sharma 3 tabs
python 
from blog.models import Post


# Load only specific fields
posts = Post.objects.only('id', 'title', 'published_at')
for post in posts:

Django query optimization with only and defer

django python database
by Priya Sharma 1 tab
python 
import magic
from django import forms
from django.core.exceptions import ValidationError
from django.template.defaultfilters import filesizeformat

Validating Upload Size and MIME Type in a Custom Django Form Field

django forms file-upload
by codesnips 3 tabs
python 
import os
import uuid

from flask import Blueprint, current_app, jsonify, request
from werkzeug.exceptions import RequestEntityTooLarge

Streaming Large Multipart File Uploads to Disk in Flask Without Buffering

flask werkzeug streaming
by codesnips 3 tabs
python 
import threading
from contextlib import contextmanager

_state = threading.local()

Per-Tenant Data Isolation in Django with a Thread-Local Current Tenant Manager

django multi-tenancy orm
by codesnips 4 tabs
python 
from __future__ import annotations

from dataclasses import dataclass, field
from decimal import Decimal, ROUND_HALF_UP
from typing import Optional, Protocol

Composable Order Discount Pipeline With Rule Objects in Python

pipeline strategy-pattern discounts
by codesnips 3 tabs
python 
import time
import uuid
from dataclasses import dataclass

import redis

Sliding-Window Per-User Rate Limiting With Redis and a Flask Decorator

rate-limiting redis flask
by codesnips 3 tabs
python 
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydb',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',

Django database connection pooling for performance

django python database
by Priya Sharma 1 tab
python 
# Debug Toolbar setup
INSTALLED_APPS += ['debug_toolbar']

MIDDLEWARE = [
    'debug_toolbar.middleware.DebugToolbarMiddleware',
] + MIDDLEWARE

Django debug toolbar for development

django python debugging
by Priya Sharma 1 tab
python 
from rest_framework.pagination import PageNumberPagination, CursorPagination


class StandardResultsSetPagination(PageNumberPagination):
    page_size = 25
    page_size_query_param = 'page_size'

Django REST Framework pagination with custom classes

django python rest
by Priya Sharma 2 tabs
python 
# Session configuration
SESSION_ENGINE = 'django.contrib.sessions.backends.cached_db'
SESSION_CACHE_ALIAS = 'default'
SESSION_COOKIE_AGE = 1209600  # 2 weeks in seconds
SESSION_COOKIE_SECURE = True  # HTTPS only
SESSION_COOKIE_HTTPONLY = True  # No JavaScript access

Django session management and custom session backends

django python sessions
by Priya Sharma 2 tabs
python 
import re

EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")


class SignupValidator:

Validate a Flask Signup Form and Collect Per-Field Errors

flask validation forms
by codesnips 4 tabs