from flask import request

def request_wants_json():

    best = request.accept_mimetypes.best_match(

        ['application/json', 'text/html']

    )

    return best == 'application/json' and \

        request.accept_mimetypes[best] > \

        request.accept_mimetypes['text/html']

def fuzzy_list_find(lst, key, value):

    for i, dic in enumerate(lst):

        if dic[key] == value:

            return i

    raise ValueError

def first(iterable, keys):

    for el in keys:

        if el in iterable:

            return el

    raise ValueError