[Python] Webフレームワーク「Bottle」のインストールから使い方を簡単に解説

pip install bottle

import bottle
print(bottle.__version__)

from bottle import Bottle, run
app = Bottle()
@app.route('/')
def home():
    return "Hello, Bottle!"
run(app, host='localhost', port=8080)

from bottle import Bottle, run
app = Bottle()
@app.route('/')
def home():
    return "Welcome to the home page!"
@app.route('/about')
def about():
    return "This is the about page."
run(app, host='localhost', port=8080)

from bottle import Bottle, run, template
app = Bottle()
@app.route('/')
def home():
    return template('<b>Hello, {{name}}!</b>', name='Bottle')
run(app, host='localhost', port=8080)

from bottle import Bottle, run, static_file
app = Bottle()
@app.route('/static/<filename>')
def server_static(filename):
    return static_file(filename, root='./static')
run(app, host='localhost', port=8080)

from bottle import Bottle, run, request
app = Bottle()
@app.route('/greet')
def greet():
    name = request.query.name or "Guest"
    return f"Hello, {name}!"
run(app, host='localhost', port=8080)

from bottle import Bottle, run, request, template
app = Bottle()
@app.route('/form', method='GET')
def form():
    return '''
        <form action="/submit" method="post">
            Name: <input name="name" type="text" />
            <input value="Submit" type="submit" />
        </form>
    '''
@app.route('/submit', method='POST')
def submit():
    name = request.forms.get('name')
    return f"Hello, {name}!"
run(app, host='localhost', port=8080)

from bottle import Bottle, run, redirect, error
app = Bottle()
@app.route('/redirect')
def redirect_example():
    return redirect('/new_location')
@app.route('/new_location')
def new_location():
    return "You have been redirected here!"
@app.error(404)
def error404(error):
    return "404 Error: Page not found."
run(app, host='localhost', port=8080)

from bottle import Bottle, run, request, response
from bottle_sqlite import SQLitePlugin
app = Bottle()
app.install(SQLitePlugin(dbfile='mydb.sqlite'))
@app.route('/add', method='POST')
def add_item(db):
    item = request.forms.get('item')
    db.execute("INSERT INTO items (name) VALUES (?)", (item,))
    return "Item added!"
run(app, host='localhost', port=8080)

import sqlite3
from bottle import Bottle, run
app = Bottle()
# データベース接続
def get_db():
    conn = sqlite3.connect('mydatabase.db')
    return conn
@app.route('/setup')
def setup():
    db = get_db()
    cursor = db.cursor()
    cursor.execute('CREATE TABLE IF NOT EXISTS items (id INTEGER PRIMARY KEY, name TEXT)')
    db.commit()
    db.close()
    return "Database setup complete!"
run(app, host='localhost', port=8080)

pip install sqlalchemy

from bottle import Bottle, run, request
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
app = Bottle()
engine = create_engine('sqlite:///mydatabase.db')
Base = declarative_base()
Session = sessionmaker(bind=engine)
class Item(Base):
    __tablename__ = 'items'
    id = Column(Integer, primary_key=True)
    name = Column(String)
Base.metadata.create_all(engine)
@app.route('/add', method='POST')
def add_item():
    session = Session()
    item_name = request.forms.get('name')
    new_item = Item(name=item_name)
    session.add(new_item)
    session.commit()
    session.close()
    return "Item added!"
run(app, host='localhost', port=8080)

@app.route('/items', method='GET')
def get_items():
    session = Session()
    items = session.query(Item).all()
    session.close()
    return "<br>".join([f"{item.id}: {item.name}" for item in items])
@app.route('/update/<id>', method='POST')
def update_item(id):
    session = Session()
    item = session.query(Item).filter(Item.id == id).first()
    if item:
        item.name = request.forms.get('name')
        session.commit()
    session.close()
    return "Item updated!"
@app.route('/delete/<id>', method='POST')
def delete_item(id):
    session = Session()
    item = session.query(Item).filter(Item.id == id).first()
    if item:
        session.delete(item)
        session.commit()
    session.close()
    return "Item deleted!"
run(app, host='localhost', port=8080)

from bottle import Bottle, run
app = Bottle()
@app.route('/')
def home():
    return "Hello, Bottle!"
run(app, host='localhost', port=8080)

pip install gunicorn

gunicorn -w 4 -b 0.0.0.0:8000 app:app

heroku create your-app-name

web: gunicorn -w 4 -b 0.0.0.0:$PORT app:app

git init
git add .
git commit -m "Initial commit"

git push heroku master

heroku open

FROM python:3.9
WORKDIR /app
COPY . /app
RUN pip install bottle gunicorn
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:8000", "app:app"]

docker build -t my-bottle-app .

docker run -p 8000:8000 my-bottle-app

from bottle import Bottle, run, request, template
app = Bottle()
posts = []
@app.route('/')
def index():
    return template('<b>Blog Posts:</b><br>{{!posts}}<br><form action="/add" method="post">New Post: <input name="post" type="text"><input value="Add" type="submit"></form>', posts="<br>".join(posts))
@app.route('/add', method='POST')
def add_post():
    post = request.forms.get('post')
    posts.append(post)
    return index()
run(app, host='localhost', port=8080)

from bottle import Bottle, run, request, response
app = Bottle()
tasks = []
@app.route('/tasks', method='GET')
def get_tasks():
    response.content_type = 'application/json'
    return {'tasks': tasks}
@app.route('/tasks', method='POST')
def add_task():
    task = request.json.get('task')
    tasks.append(task)
    response.status = 201
    return {'task': task}
@app.route('/tasks/<index>', method='DELETE')
def delete_task(index):
    if 0 <= int(index) < len(tasks):
        removed_task = tasks.pop(int(index))
        return {'removed': removed_task}
    response.status = 404
    return {'error': 'Task not found'}
run(app, host='localhost', port=8080)

from bottle import Bottle, run, request, template, redirect, response
app = Bottle()
users = {'user': 'password'}  # 簡易的なユーザー情報
@app.route('/')
def home():
    return template('<b>Welcome! Please <a href="/login">login</a>.</b>')
@app.route('/login', method='GET')
def login_form():
    return '''
        <form action="/login" method="post">
            Username: <input name="username" type="text" />
            Password: <input name="password" type="password" />
            <input value="Login" type="submit" />
        </form>
    '''
@app.route('/login', method='POST')
def login():
    username = request.forms.get('username')
    password = request.forms.get('password')
    if users.get(username) == password:
        response.set_cookie("username", username)
        return redirect('/welcome')
    return "Login failed!"
@app.route('/welcome')
def welcome():
    username = request.get_cookie("username")
    if username:
        return f"Hello, {username}!"
    return redirect('/')
run(app, host='localhost', port=8080)