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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def view_mean_disagg(token, dstore):
 """ Display mean quantities for the disaggregation. Useful for checking differences between two calculations. """

    tbl = []
    for key, dset in sorted(dstore['disagg'].items()):
        vals = [ds.value.mean() for k, ds in sorted(dset.items())]
        tbl.append([key] + vals)
    header = ['key'] + sorted(dset)
    return rst_table(sorted(tbl), header=header)