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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Flask - Backend com Python - Semcomp 18
- 1. FLASK - BACKEND COM PYTHON
- 2. SIBELIUS SERAPHINI 2010-2015 Bacharel em Ciências de Computação 2015 Full Stack Developer
- 3. O QUE É BACKEND?
- 5. LET’S CODE
- 6. VIRTUALENV # Cria um virtualenv com nome hello com Python3 mkvirtualenv hello -p /usr/local/bin/python3 # Lista virtualenvs workon # inicia virtualenv hello workon hello # desativa virtualenv deactivate
- 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
- 9. ESTRUTURA FLASK ├── Procfile ├── manage.py ├── requirements.txt ├── runtime.txt ├── semcomp │ ├── __init__.py │ ├── api │ │ ├── __init__.py │ │ ├── routes.py │ │ └── tarefa.py │ ├── main │ │ ├── __init__.py │ │ ├── errors.py │ │ └── views.py │ ├── models.py │ ├── static │ └── templates │ └── 404.jade │ └── base.html └── uwsgi.ini App Grande git clone https://github.com/sibeliusseraphini/semcomp-flask.git
- 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
- 12. JINJA2 - TEMPLATING <title>{% block title %}{% endblock %}</title> <ul> {% for user in users %} <li><a href="{{ user.url }}">{{ user.username }}</a></li> {% endfor %} </ul>
- 13. JADE <!DOCTYPE html> <html lang="en"> <head> <title>Jade</title> <script type="text/javascript"> if (foo) { bar(1 + 5) } </script> </head> <body> <h1>Jade - node template engine</h1> <div id="container" class="col"> <p>You are amazing</p> <p> Jade is a terse and simple templating language with a strong focus on performance and powerful features. </p> </div> </body> </html> doctype html html(lang="en") head title= pageTitle script(type='text/javascript'). if (foo) { bar(1 + 5) } body h1 Jade - node template engine #container.col if youAreUsingJade p You are amazing else p Get on it! p. Jade is a terse and simple templating language with a strong focus on performance and powerful features.
- 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