def categorical_partition_data(data):
    """Convenience method for creating weights from categorical data.

    Args:
        data (list-like): The data from which to construct the estimate.

    Returns:
        A new partition object::

            {
                "partition": (list) The categorical values present in the data
                "weights": (list) The weights of the values in the partition.
            }
    """

    # Make dropna explicit (even though it defaults to true)
    series = pd.Series(data)
    value_counts = series.value_counts(dropna=True)

    # Compute weights using denominator only of nonnull values
    null_indexes = series.isnull()
    nonnull_count = (null_indexes == False).sum()

    weights = value_counts.values / nonnull_count
    return {
        "values": value_counts.index.tolist(),
        "weights": weights
    }