spec.py 文件源码

def _update(d, u):
    """Update a nested dict recursively in place.

    >>> _update({'a': 0, 'b': 2}, {'a': 1})
    {'a': 1, 'b': 2}

    >>> _update({'a': {'b': 1}}, {'a': 0})
    {'a': 0}

    >>> d = _update({'a': {'b': 1}}, {'a': {'c': 2}})
    >>> d == {'a': {'b': 1, 'c': 2}}
    True
    """
    for k, v in six.iteritems(u):
        r = d.get(k, {})
        if isinstance(v, Mapping) and isinstance(r, Mapping):
            _update(r, v)
            d[k] = r
        else:
            d[k] = u[k]
    return d