Return item as ``dict.__getitem__` but using keys with dots.

    It does not address indexes in iterables.

def dottable_getitem(data, dottable_key, default=None):
    """Return item as ``dict.__getitem__` but using keys with dots.

    It does not address indexes in iterables.
    """
    def getitem(value, *keys):
        if not keys:
            return default
        elif len(keys) == 1:
            key = keys[0]
            if isinstance(value, MutableMapping):
                return value.get(key, default)
            elif isinstance(value, Sequence) and \
                    not isinstance(value, six.string_types):
                return [getitem(v, key) for v in value]
            return default
        return getitem(getitem(value, keys[0]), *keys[1:])
    return getitem(data, *dottable_key.split('.'))