Flask-Weixin is the implementation for http://mp.weixin.qq.com/ with the flavor of Flask. It can be used without Flask too.

You can install Flask-Weixin with pip:

$ pip install Flask-Weixin

Or, with setuptools easy_install in case you didn't have pip:

$ easy_install Flask-Weixin

Eager to get started? It is always the Flask way to create a new instance:

from flask_weixin import Weixin

weixin = Weixin(app)

Or pass the app later:

weixin = Weixin()
weixin.init_app(app)

However, you need to configure before using it, here is the configuration list:

• WEIXIN_TOKEN: this is required
• WEIXIN_SENDER: a default sender, optional
• WEIXIN_EXPIRES_IN: not expires by default

For Flask user, it is suggested that you use the default view function:

app.add_url_rule('/', view_func=weixin.view_func)

@weixin.register('*')
def reply(**kwargs):
    username = kwargs.get('sender')
    sender = kwargs.get('receiver')
    content = kwargs.get('content')
    return weixin.reply(
        username, sender=sender, content=content
    )

The example above will reply anything the user sent.

Or you can register a function to handle a specific keyword:

@weixin.register('help')
def reply_help(**kwargs):
    ...

this function will be used to handle text message help.

There are more ways to match messages to handlers:

@weixin.register(type='event', event='subscribe')
def send_welcome(**kwargs):
    username = kwargs.get('sender')
    sender = kwargs.get('receiver')
    return weixin.reply(username, sender=sender, content='Thanks for follow!')

this function will send a message to new followers.

Every message from weixin has these information:

• id: message ID
• receiver: which is ToUserName in the official documentation
• sender: which is FromUserName in the official documentation
• type: message type
• timestamp: message timestamp

Text type has an extra data: content.

Image type has an extra data: picurl.

Link type has extra data:

• title: article title
• description: article description
• url: original url of the article

Location type has extra data:

• location_x
• location_y
• scale
• label

Event type has extra data:

• event
• event_key
• latitude
• longitude
• precision

Event type has extra data:

• media_id
• format
• recognition