Introduction

This is a memo for myself, the details are as follows.

I started Python about a week ago and wanted to run something on the server.
I checked the types of web frameworks.
Django seems to be the most popular, but it seems to be a little hurdle for beginners.
I don't want to be frustrated suddenly, so I chose Bottle for beginners for the time being.

Execution environment

OS X 10.9.5
python 3.5.1
PyCharm Community Edition 2016.1.2

Thing you want to do

Try moving it for the time being.
Try dynamic routing
Use the received parameters
Constraint parameters
Try GET, POST
Try to display the error page

What i did

Let's move it for the time being.

Don't think it's difficult, first try until Hello World is displayed in the browser.

#pip install to import
$ pip install bottle

# -*- coding:utf-8 -*-

from bottle import route, run


@route('/hello')
def hello():
    return "Hello World!"


run(host='localhost', port=8080, debug=True)

Run it in PyCharm and open it in your browser. http://localhost:8080/hello

Now you can see Hello World in your browser !! Amazing Bottle

Try dynamic routing

# -*- coding:utf-8 -*-

from bottle import route, run


@route('/hello/')
@route('/hello/<user>')
def hello(user="taro"):
    return "Hello {user}".format(user=user)


@route('/date/<month:re:[a-z]+>/<day:int>/<path:path>')
def date(month, day, path):
    return "{month}/{day} {path}".format(month=month, day=day, path=path)


run(host='localhost', port=8080, debug=True)

Use the received parameters

By defining the default in the argument of the method to be executed, it can be displayed even when user is not passed. http://localhost:8080/hello/

http://localhost:8080/hello/masaibar

Constraint parameters

Simple value constraints can be given.

re regular expression
int int value
recognizes path / as part of the path

http://localhost:8080/date/april/29//dev/null

Try GET, POST

It seems that there are two ways to write annotations such as GET and POST. @get ('/ hoge') and @route ('/ hoge', method ='GET') have the same behavior.

The passed value is received by referring to the following variables.

Request.query for GET request
Request.forms for POST requests

In addition, you can receive various data such as headers and request body. Reference

# -*- coding:utf-8 -*-

from bottle import route, run
from bottle import get, post, request


@route('/login', method='GET')  # or @get('/login')
def login():
    username = request.query.get('user')
    password = request.query.get('pass')

    #Username when nothing is passed in GET,Don't put anything in password
    username = "" if username is None else username
    password = "" if password is None else password

    return '''
    <form action="/login" method="post">
            Username: <input name="username" type="text" value="{username}"/>
            Password: <input name="password" type="password" value="{password}"/>
            <input value="Login" type="submit" />
        </form>
    '''.format(username=username, password=password)


@route('/login', method='POST')  # or @post('/post')
def do_login():
    username = request.forms.get('username')
    password = request.forms.get('password')

    return "{username} {password}".format(username=username, password=password)


run(host='localhost', port=8080, debug=True)

GET http://localhost:8080/login

http://localhost:8080/login?user=hoge&pass=fuga

POST

Try to display the error page

# -*- coding:utf-8 -*-

from bottle import route, run
from bottle import error


@route('/hello')
def hello():
    return "Hello World!"


@error(404)
def error404(error):
    return "Nothing here sorry {error}".format(error=error)


run(host='localhost', port=8080, debug=True)

I deliberately step on a URL that doesn't exist. http://localhost:8080/hellow

in conclusion

To be honest, I was surprised that it moved easier than I expected. This time, I focused on moving it without thinking about templates, but when I looked it up, I felt that there were quite a few people using only the template engine. (Is Jinja2 popular?)

reference

Tutorial — Bottle 0.13-dev documentation : http://bottlepy.org/docs/dev/tutorial.html Easy introduction of 6 kinds of Python web frameworks --Mojilog: http://mojix.org/2013/04/13/python-six-wafs Master the Request / Response object for Bottle-Qiita: http://qiita.com/tomotaka_ito/items/62fc4d58d1be7867a158 Comparison of None in Python is using is not the == - is Hello Hello monmon! : http://monmon.hateblo.jp/entry/20110214/1297710749

When a Python beginner tried using Bottle, it worked unexpectedly easily.