Logout a User

When all the fun is over, a user logs out by clicking the logout link at the top of the page, which sends a GET request to the /logout view:

@app.route('/logout', methods=['GET'])
def logout():
    session.pop('username', None)
    flash('Logged out.')
    return redirect(url_for('index'))

This removes username from the session object and takes the visitor back to the home page.

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