setup-python-env

Check for an existing .venv directory first; if none exists, create one with uv venv .venv or python3 -m venv .venv, then activate it with source .venv/bin/activate. Finally install Reflex with uv add reflex or pip install reflex.

Use uv when it is available because it handles project initialization and environment creation in one toolchain. If uv is not installed, fall back to python3 -m venv and pip, upgrading pip before installing Reflex.

Python 3.10 or newer is required. Check your version with python3 --version before creating the environment, and install a newer Python release if the version is older than 3.10.

Import failures usually mean no virtual environment exists or Reflex is not installed in the active environment. Create and activate a .venv, then verify installation with pip show reflex and install it if missing.

Yes. If a .venv directory already exists in the project root, activate it with source .venv/bin/activate and skip creation. Then only check whether Reflex is installed and install it if needed.