ae0d302c735720739ed4e1bc1e1a231df24356c0,pandas/core/reshape/reshape.py,,_stack_multi_columns,#Any#Any#Any#,596

Before Change

    // tuple list excluding level for grouping columns
    if len(frame.columns.levels) > 2:
        tuples = list(
            zip(
                *[
                    lev.take(level_codes)
                    for lev, level_codes in zip(
                        this.columns.levels[:-1], this.columns.codes[:-1]
                    )
                ]
            )
        )
        unique_groups = [key for key, _ in itertools.groupby(tuples)]
        new_names = this.columns.names[:-1]
        new_columns = MultiIndex.from_tuples(unique_groups, names=new_names)
    else:

After Change

    // tuple list excluding level for grouping columns
    if len(frame.columns.levels) > 2:
        levs = []
        for lev, level_codes in zip(this.columns.levels[:-1], this.columns.codes[:-1]):
            if -1 in level_codes:
                lev = np.append(lev, None)
            levs.append(np.take(lev, level_codes))
        tuples = list(zip(*levs))
        unique_groups = [key for key, _ in itertools.groupby(tuples)]
        new_names = this.columns.names[:-1]
        new_columns = MultiIndex.from_tuples(unique_groups, names=new_names)
    else:

Instances