history_container.py 文件源码

def compute_largest_specs(history_specs):
    """
    Maps a Frequency to the largest HistorySpec at that frequency from an
    iterable of HistorySpecs.
    """
    return {key: max(group, key=lambda f: f.bar_count)
            for key, group in groupby(
                sorted(history_specs, key=freq_str_and_bar_count),
                key=lambda spec: spec.frequency)}


# tuples to store a change to the shape of a HistoryContainer