def primer_mes_baix(comercials, v):
    for ident, zona, vendes in comercials:
        if vendes < v:
            return ident
    return -1

def elimina_id(comercials, ident):
    nova = []
    for com in comercials:
        if com[0] != ident:
            nova.append(com)
    return nova

# Una altra versió amb comprensions

def elimina_id_2(comercials, ident):
    nova = [com for com in comercials if com[0] != ident]
    return nova

def politica_drastica(comercials, v):
    r = comercials
    ident = primer_mes_baix(comercials, v)
    if ident != -1:
        r = elimina_id(comercials, ident)
    return r