Explaining how to make LINE BOT in the world's easiest way (2) [Preparing a bot application in a local environment with Django in Python]

Introduction

Last time, I created an account for Line Bot. From this time, we will build a system for Line Bot in earnest.

I often see commentary articles written in PHP for building a Line Bot system, but this time I will build a system using Python. The reason is that we plan to use "natural language processing" such as analyzing the sentences exchanged by Line Bot and giving the best answer to it, and Python has abundant libraries of such natural language processing systems. is.

Then, we will create an application for bots using "Django", which is the most typical Python web framework. If you've created Django or other web applications, you can proceed as it is, but if you're a beginner or want to know how to use Django, you can read the commentary I wrote earlier. It's easy, so please take a look.

Development environment

• OS: Mac OS Sierra (10.12)
• Python 3.5.2
• Django 1.10.3 * Install after this

We will proceed on the premise of a Mac environment.

Check the Python version as follows.

Check the python version of your system

$ python3 --version
Python 3.5.2

Install django

$ pip3 install django==1.10.3

Django version check

$ python3
Python 3.5.2 (default, Jun 29 2016, 13:43:58)
[GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
>>> django.get_version()
'1.10.3'

Create a project for Line Bot API

First, create a Python VirtualEnvironment for the API, which is the biggest way to proceed with a Python project.

$ python3 -m venv api

Then create a project in this. This is also named ʻapi`.

Creating a project

$ cd api
$ django-admin startproject api .

Isn't this a virtual environment? apiA directory named is created, and the directory structure is as follows.

Check directory structure (bin etc. omitted)

$ tree -L 2 api
api
├── api
│   ├── __init__.py
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
├── bin
├── include
├── lib
├── manage.py
└── pyvenv.cfg

Creating a Django application

In this ʻapi project, we will create an application called linebot. First, install the python web framework Django. Keep the Django version as the current latest version, 1.10.3`.

Then, we will create a linebot application in this ʻapi` project.

Creating an application

$ cd api
$ django-admin startapp linebot .
$ tree -L 1 .
api
├── api
├── bin
├── include
├── lib
├── linebot
├── manage.py
└── pyvenv.cfg

Settings after creating a Django application

After creating the application, various settings are required, but here we will introduce only the minimum required ones.

api/settings.py (part)

# Application definition
INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'linebot',  #add to
)
#Change time zone
LANGUAGE_CODE = 'ja'
TIME_ZONE = 'Asia/Tokyo'
USE_TZ = False  #Changed to False by Default because of UTC timezone

Database (SQLite) settings

Set the DB. This time, we will use SQLite without any changes from the initial settings.

DB settings

$ python3 manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK

  Applying admin.0002_logentry_remove_auto_add... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying sessions.0001_initial... OK

Start the server

Now, let's start the server locally and check if the default web page is displayed.

Start web server

$ python3 manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).
November 12, 2016 - 13:04:05
Django version 1.10.3, using settings 'linebot.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

Once the web server is up, you can access http://127.0.0.1:8000/ from your browser.

Summary

Now you have a local development environment.

The Line bot is not local and can only be run by placing this web application on a remote server. So, next time, I will explain how to synchronize this application to the server.

Next commentary article

The world's most easy-to-understand explanation of how to make LINE BOT (3) [Linkage with server with Git]

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