Flask - Backend com Python - Semcomp 18
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This document discusses Flask, a Python-based web application framework. It provides an overview of Flask fundamentals like backend development, virtual environments, routes, templates, and error handling. It also covers additional Flask features like extensions, MongoDB integration, and building REST APIs. The document uses code samples and file structure examples to demonstrate how to structure and deploy a Flask application on Heroku.
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![DEPLOY TO
1. Criar um app no Heroku - heroku apps:create semcomp18
2. Adicionar runtime.txt - python-3.4.2
3. Adicionar Procfile - web: uwsgi uwsgi.ini
4. Install uWSGI - pip install uwsgi
5. Adicionar configuração do uWSGI - uwsgi.ini
6. Criar requirements.txt - pip freeze > requirements.txt
7. Realizar release - git push heroku master
[uwsgi]
http-socket = :$(PORT)
master = true
processes = 8
threads = 4
die-on-term = true
module = hello:app
memory-report = true
offline-threads = 4
harakiri = 500
harakiri-verbose = true](https://image.slidesharecdn.com/semcomppresentation-150821135234-lva1-app6892/85/Flask-Backend-com-Python-Semcomp-18-8-320.jpg)
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- 7. #!/usr/bin/env python3 from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return 'Hello SemComp!' if __name__ == '__main__': app.run() $ pip install Flask $ python hello.py * Running on http://localhost:5000/ git clone https://github.com/sibeliusseraphini/hello-flask.git
- 8. DEPLOY TO 1. Criar um app no Heroku - heroku apps:create semcomp18 2. Adicionar runtime.txt - python-3.4.2 3. Adicionar Procfile - web: uwsgi uwsgi.ini 4. Install uWSGI - pip install uwsgi 5. Adicionar configuração do uWSGI - uwsgi.ini 6. Criar requirements.txt - pip freeze > requirements.txt 7. Realizar release - git push heroku master [uwsgi] http-socket = :$(PORT) master = true processes = 8 threads = 4 die-on-term = true module = hello:app memory-report = true offline-threads = 4 harakiri = 500 harakiri-verbose = true
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- 10. BLUEPRINT api - www.mywebpage.com/api admin - www.mywebpage.com/admin mobile - www.mywebpage.com/mobile •Modular apps from . import main from flask import render_template @main.route('/') def index(): return "It's working @main.route('/hello/<name>') def hello(name): return render_template('hello.html', name=name)
- 11. STATIC FILES + TEMPLATES from flask import render_template from . import main @main.route('/hello/<name>') def hello(name): return render_template('hello.html', name=name) •static files - app/static •templates - app/templates
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- 14. PYJADE (JINJA2 + JADE) app.jinja_env.add_extension(‘pyjade.ext.jinja.PyJadeExtension') pip install pyjade
- 15. ERROR HANDLING from flask import render_template from . import main @main.app_errorhandler(404) def page_not_found(e): return render_template('404.jade'), 404 •404 Not Found •403 Forbidden •410 Gone •500 Internal Server Error
- 16. EXTENSÕES Flask-Script - scripts externos Flask-RESTful - REST APIs fácil Flask-JWT - autenticação por token JWT Flask-Weasyprint - HTML as PDF Flask-Mail - email para Flask Flask-Login - gerenciamento de sessão de usuário
- 18. REST GET /api/tarefa - retorna todas as tarefas GET /api/tarefa/:id - retorna a tarefa :id PUT /api/tarefa/:id - atualiza a tarefa :id DELETE /api/tarefa/:id - delete/remove tarefa :id POST /api/tarefa - cria uma nova tarefa