Python Flask Converter Usage Explained

Default Converter

from flask import Flask

app = Flask(__name__)

#/user/123
@('/users/<user_id>')
def get_users_data(user_id):
	return 'get user{}'.format(user_id)

This 123 is the string str

在这里插入图片描述

from flask import Flask

app = Flask(__name__)

#/user/123
@('/users/<int：user_id>')
def get_users_data(user_id):
	return 'get user{}'.format(user_id)

在这里插入图片描述

Custom Converter

Defining Methods

Customizing the converter is done in 3 main steps

1. Create a converter class to save the regular expression for matching.

from  import BaseConverter

class MobileConverter(BaseConverter):
    """
    Cell Phone Number Format
    """
    regex = r'1[3-9]\d{9}]'

Note that the regex name is fixed

2. Inform the Flask application of the customized converter

app = Flask(__name__)
# Add the custom converter to the converter dictionary and specify that the converter is used with the name: mobile
app.url_map.converters['mobile'] = MobileConverter

3. Define the use of converters where they are used

@('/sms_codes/<mobile:mob_num>')
def send_sms_code(mob_num):
    return 'send sms code to {}'.format(mob_num)

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