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PYTHON Snippets.

Sorting a List of Dictionaries by Multiple Keys

Discover how to sort a list of dictionaries in Python by one or more keys, using `itemgetter` for performance or `lambda` for flexibility.

Using `namedtuple` for Immutable, Readable Data Records

Create lightweight, readable, and immutable object-like data structures in Python using `collections.namedtuple` for cleaner code and structured data.

Secure File Upload Validation and Storage in Python Flask

Learn to securely handle file uploads in Python Flask, implementing robust checks for file type, size, and storing files safely outside the web root to prevent attacks.

Implement Cross-Site Request Forgery (CSRF) Protection in Flask

Secure your Flask web application against CSRF attacks by integrating Flask-CSRFProtect to generate and validate CSRF tokens on forms, ensuring request authenticity.

Securely Hash and Verify Passwords with Python Bcrypt

Learn to implement strong password security in Python applications using the `bcrypt` library for hashing and verifying passwords, protecting user credentials effectively.

Efficiently Merge Multiple Python Dictionaries

Learn how to efficiently merge two or more Python dictionaries using the `**` operator for Python 3.5+ or the clean `|` operator for Python 3.9+, handling key conflicts.

Transform and Filter Lists with Python List Comprehensions

Master Python list comprehensions to efficiently filter elements and apply transformations, creating new lists based on existing data structures for clean and concise code.

Leverage Python Sets for Unique Items and Data Operations

Discover how to use Python sets to easily find unique elements, perform efficient intersection, union, and difference operations, ideal for managing distinct data points.

Build a Simple LRU Cache with Python's OrderedDict

Implement a basic Least Recently Used (LRU) cache in Python using `collections.OrderedDict` to efficiently manage limited-size caches in web applications for performance optimization.

Group Data Efficiently Using Python's defaultdict

Simplify data grouping tasks in Python by leveraging `collections.defaultdict`, automatically handling missing keys and appending items to lists or other structures.

Prevent SQL Injection with Python's Psycopg2 Prepared Statements

Secure your PostgreSQL database queries in Python by using parameterized queries with the `psycopg2` library to effectively prevent SQL injection vulnerabilities.

Implement Robust Server-Side Input Validation in Python Flask

Secure your Flask API by implementing comprehensive server-side input validation, ensuring data integrity and preventing common vulnerabilities like injection attacks.