Download E-books Flask Web Development: Developing Web Applications with Python PDF

By Miguel Grinberg

Take complete artistic keep an eye on of your net functions with Flask, the Python-based microframework. With this hands-on booklet, you’ll examine Flask from the floor up via constructing a whole social running a blog software step by step. writer Miguel Grinberg walks you thru the framework’s middle performance, and indicates you the way to increase functions with complicated net thoughts similar to database migration and net provider communication.

instead of impose improvement instructions as different frameworks do, Flask leaves the enterprise of extensions as much as you. when you've got Python event, this booklet indicates you ways to exploit that artistic freedom.

  • Learn Flask’s simple program constitution and write an instance app
  • Work with must-have components—templates, databases, internet types, and electronic mail support
  • Use applications and modules to constitution a wide program that scales
  • Implement consumer authentication, roles, and profiles
  • Build a running a blog characteristic through reusing templates, paginating merchandise lists, and dealing with wealthy text
  • Use a Flask-based Restful Api to show app performance to smartphones, drugs, and different third-party clients
  • Learn how you can run unit checks and increase software performance
  • Explore innovations for deploying your net app to a construction server

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Ext. login import logout_user, login_required @auth. route('/logout') @login_required def logout(): logout_user() flash('You were logged out. ') go back redirect(url_for('main. index')) To log a consumer out, Flask-Login’s logout_user() functionality is named to take away and reset the consumer consultation. The logout is done with a flash message that confirms the motion and a redirect to the house web page. when you've got cloned the application’s Git repository on GitHub, you could run git checkout 8c to try this model of the applying. This replace incorporates a database migration, so you should definitely run python deal with. py db improve once you try out the code. to make sure that you might have all of the dependencies put in, additionally run pip set up -r standards. txt. trying out Logins to make sure that the login performance is operating, the house web page should be up to date to greet the logged-in person through identify. The template part that generates the greeting is proven in instance 8-14. instance 8-14. app/templates/index. html: Greet the logged-in person hi, {% if current_user. is_authenticated() percent} {{ current_user. username }} {% else percent} Stranger {% endif %}! during this template once more current_user. is_authenticated() is used to figure out even if the person is logged in. simply because no person registration performance has been equipped, a brand new person may be registered from the shell: consumer Authentication with Flask-Login | ninety nine (venv) $ python deal with. py shell >>> u = User(email='john@example. com', username='john', password='cat') >>> db. consultation. add(u) >>> db. consultation. commit() The consumer created formerly can now log in. determine 8-2 exhibits the appliance domestic web page with the consumer logged in. determine 8-2. domestic web page after profitable login New person Registration while new clients are looking to turn into participants of the applying, they have to check in with it in order that they are recognized and will log in. A hyperlink within the login web page will ship them to a registration web page, the place they could input their electronic mail deal with, username, and password. including a consumer Registration shape the shape that would be utilized in the registration web page asks the consumer to go into an e-mail tackle, username, and password. this way is proven in instance 8-15. instance 8-15. app/auth/forms. py: consumer registration shape from flask. ext. wtf import shape from wtforms import StringField, PasswordField, BooleanField, SubmitField from wtforms. validators import Required, size, e-mail, Regexp, EqualTo a hundred | bankruptcy eight: consumer Authentication from wtforms import ValidationError from .. versions import consumer category RegistrationForm(Form): e mail = StringField('Email', validators=[Required(), Length(1, 64), Email()]) username = StringField('Username', validators=[ Required(), Length(1, 64), Regexp('^[A-Za-z][A-Za-z0-9_. ]*$', zero, 'Usernames should have merely letters, ' 'numbers, dots or underscores')]) password = PasswordField('Password', validators=[ Required(), EqualTo('password2', message='Passwords needs to fit. ')]) password2 = PasswordField('Confirm password', validators=[Required()]) publish = SubmitField('Register') def validate_email(self, field): if person.

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