Why Use uv Instead of pip?

uv is a next-generation Python package manager and virtual environment tool. Here’s why many developers are choosing it over pip

1. Speed ⚡
   uv is written in Rust, making installs and dependency resolution significantly faster than pip.
2. Built-in Virtualenvs 📦
   Unlike pip, uv automatically manages virtual environments—no need for venv or virtualenv.
3. Better Dependency Resolution 🔄
   uv uses a modern dependency resolver similar to Poetry, but faster and simpler to use.
4. Drop-in Replacement 🛠️
   You can use uv commands very similarly to pip, so the learning curve is almost zero.
5. Reproducibility ✅
   Lockfile support ensures environments are consistent across machines, much like Poetry or Pipenv.

In short: uv = the speed of Rust + the simplicity of pip + the reliability of Poetry.

Project Setup with uv

1. Install uv

pip install uv

1. Create a New Project

uv init fastapi-langchain-app

cd fastapi-langchain-app

1. Add Dependencies

uv add "fastapi[all]" langchain langchain-openai python-dotenv sqlalchemy uvicorn psycopg2-binary