Learning Flask

I touched both bottle and Django, so Flask. As usual, we will use the Twitter API again.

$ python3 -m venv flaskworks
$ ls flaskworks/
$ . flaskworks/bin/activate
(flaskworks)$ pip install flask
(flaskworks)$ pip install requests requests_oauthlib

It's very easy to create a directory like a bottle.

(flaskworks)$ cd flaskworks
(flaskworks)$ mkdir static
(flaskworks)$ mkdir templates

Make a template

Create two because it uses template inheritance.

`base.html`


<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="/static/css/style.css">
    <link rel="stylesheet" href="/static/css/bootstrap.min.css">
    <title>Tweet</title>
</head>
<body>
  <div class="container">
    <div class="row">
      <form method="post" action="/send">
        <input type="text" id="msg" name="msg">
        <input type="submit" value="Send Form">
      </fomr>
        {% block content %}
        {% endblock %}
    </div>
  </div>
</body>
</html>

`index.html`


{% extends "base.html" %}
{% block content %}
  {% if msg %}
  <p>「{{msg}}I posted</p>
  {% endif %}
{% endblock %}

Write an application for posting

For the time being, I decided to add a simple login function. The reality is almost the same as bottle, isn't it?

`tweet.py`


import os
from requests_oauthlib import OAuth1Session
import requests
from flask import Flask, render_template, request, redirect, url_for, session
app = Flask(__name__)

app.config['SECRET_KEY'] = os.urandom(24)

C_KEY = '＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋'
C_SECRET = '＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋'
A_KEY = '＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋'
A_SECRET = '＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋＋'

Post_API = 'https://api.twitter.com/1.1/statuses/update.json'
tw = OAuth1Session(C_KEY,C_SECRET,A_KEY,A_SECRET)

@app.route('/')
def index():
    if 'username' in session:
        return render_template('index.html')
    return '''
        <p>Please login</p>
    '''

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form['username']
        if username == 'admin':
            session['username'] = request.form['username']
            return redirect(url_for('index'))
        else:
            return '''<p>The user name is different</p>'''
    return '''
        <form action="" method="post">
            <p><input type="text" name="username">
            <p><input type="submit" value="Login">
        </form>
    '''

@app.route('/logout')
def logout():
    session.pop('username', None)
    return redirect(url_for('index'))

@app.route('/send', methods=['GET', 'POST'])
def send():
    if request.method == 'POST':
        msg = request.form['msg']
        url = Post_API
        params = {'status': msg,'lang': 'ja'}
        req = tw.post(url, params = params)

        return render_template('index.html', msg=msg)

if __name__ == '__main__':
    app.debug = True
    app.run()

Operation check

(flaskworks)$ python tweet.py

That's it.

It's a thin book, but it's summarized https://www.amazon.co.jp/dp/B0714D1VGP

Twitter posting client made with Flask with simple login function