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      • Environment Setup

      This chapter introduces how to prepare a development environment for Flask projects.

      Prerequisites: Python 3.9+ already installed; recommended to use VS Code + Python extension.

      Steps:

      1. Create project folder and enter it
      2. Create and activate virtual environment
      3. Install Flask
      4. Verify installation

      Windows (PowerShell):

      mkdir flask-demo; cd flask-demo
python -m venv .venv
.venv\Scripts\Activate.ps1
pip install --upgrade pip
pip install "flask>=2.3"
python -c "import flask, sys; print('Flask', flask.__version__, sys.executable)"

      macOS/Linux (bash/zsh):

      mkdir flask-demo && cd flask-demo
python3 -m venv .venv
source .venv/bin/activate
pip install --upgrade pip
pip install "flask>=2.3"
python -c "import flask, sys; print('Flask', flask.__version__, sys.executable)"

      Optional Tools:

      • pip-tools/poetry/pdm: Dependency management
      • ruff/black/isort: Code quality
      • pre-commit: Commit hooks

      Common Issues:

      • Windows activation script error: Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned as administrator and retry
      • Multiple Python versions: Use py -3.11 -m venv .venv or explicitly use the Python path