Flask Framework Cookbook - Second Edition

How to do it...

First, let's create a filter to format a currency based on the current local language. Add the following code to my_app/__init__.py:

import ccy 
from flask import request 
 
@app.template_filter('format_currency') 
def format_currency_filter(amount): 
    currency_code = ccy.countryccy(request.accept_languages.best[-       2:]) 
    return '{0} {1}'.format(currency_code, amount) 

request.accept_languages might not work in cases where a request does not have the ACCEPT-LANGUAGES header.

The preceding snippet will require the installation of a new package, ccy, as follows:

$ pip3 install ccy

The filter created in this example takes the language that best matches the current browser locale (which, in my case, is en-US), takes the last two characters ...