CI/CD pipeline for Flask

Introduction

A CI/CD pipeline helps you automatically test and deliver your Flask app. It saves time and reduces mistakes by making sure your app works well before it goes live.

You want to automatically test your Flask app every time you change the code.

You want to deploy your Flask app to a server without doing it manually.

You want to catch errors early before users see them.

You want to speed up your development by automating repetitive tasks.

You want to keep your app updated on a cloud service like Heroku or AWS.

Syntax

Flask

name: Flask CI/CD Pipeline
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.12'
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
      - name: Run tests
        run: |
          pytest
      - name: Deploy
        if: success()
        run: |
          echo "Deploying Flask app..."
          # Add your deploy commands here

This example uses GitHub Actions syntax for a CI/CD pipeline.

Replace the deploy step with commands specific to your hosting service.

Examples

This example runs tests on every push to the repository.

Flask

on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.12'
      - name: Install dependencies
        run: pip install -r requirements.txt
      - name: Run tests
        run: pytest

This example deploys the app only when code is pushed to the main branch.

Flask

on:
  push:
    branches:
      - main
jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Deploy to Heroku
        run: |
          heroku login
          git push heroku main

Sample Program

This pipeline runs on every push. It checks out the code, sets up Python 3.12, installs dependencies, runs tests with pytest, and if tests pass, it runs a deploy step (here just a placeholder echo command).

Flask

name: Flask CI/CD Pipeline
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.12'
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
      - name: Run tests
        run: |
          pytest
      - name: Deploy
        if: success()
        run: |
          echo "Deploying Flask app..."

Important Notes

Make sure your Flask app has tests written with pytest or another test tool.

Customize the deploy step to match your hosting environment (Heroku, AWS, etc.).

Use secrets or environment variables to keep sensitive info safe during deployment.

Summary

CI/CD pipelines automate testing and deployment for Flask apps.

They run on code changes to catch errors early and speed up delivery.

Use GitHub Actions or similar tools to create your pipeline easily.