Function flatten

celery/app/defaults.py:383–392

Flatten settings.

(d, root='', keyfilter=_flatten_keys)

def flatten(d, root='', keyfilter=_flatten_keys):
    """Flatten settings."""
    stack = deque([(root, d)])
    while stack:
        ns, options = stack.popleft()
        for key, opt in options.items():
            if isinstance(opt, dict):
                stack.append((ns + key + '_', opt))
            else:
                yield from keyfilter(ns, key, opt)


DEFAULTS = {