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Here is a tentative

def filtre_iso(liste_posets):
    from collections import defaultdict
    table = defaultdict(list)
    for po in liste_posets:
        dp = po.degree_polynomial()
        connus = table[dp]
        if not any(q.is_isomorphic(po) for q in connus):
            table[dp].append(po)
    return table