gistfile1.py

def get_param(name, **kwargs):
    value = request.values.get(name, **kwargs)
    if value is None:
        raise BadRequest()
    return value


def get_params(name, **kwargs):
    values = request.values.getlist(name, **kwargs)
    if len(values) == 0:
        raise BadRequest()
    return values


def get_file(name, mimetype=None):
    if name not in request.files:
        raise BadRequest()
    if mimetype is not None and \
       not request.files[name].mimetype.startswith(mimetype):
        raise NotAcceptable()
    return request.files[name]