Extended JSON encoder for flask

ExtJSONEncoder

from flask import json

class ExJSONEncoder(json.JSONEncoder):
    '''Extended JSON encoder for more type support'''

    def default(self, o):
        if isinstance(o, set):
            return list(o)
        elif isinstance(o, arrow.Arrow):
            o = o.datetime
        elif isinstance(o, Decimal):
            return str(o)

        return super(ExJSONEncoder, self).default(o)