# trecho igual ao da pergunta
def busca(setor):
matriz = [["Adalberto Ferreira", "566", "Contabilidade", "(21)84564-5248"],
["Juliana Vasconcelos", "465", "RH", "(21)3555-4552"],
["Flavia Amorim", "565", "Contabilidade", "(21)2134-4845"]]
nome = matriz[0][0], matriz[1][0], matriz[2][0]
registro = matriz[0][1], matriz[1][1], matriz[2][1]
setor = matriz[0][2], matriz[1][2], matriz[2][2]
telefone = matriz[0][3], matriz[1][3], matriz[2][3]
# daqui pra baixo é o que você sugeriu mudar
if setor == matriz[1][3]:
return [nome[1][0:], registro[1][1:], telefone[1][3:]]
else:
return [[nome[0][0:], registro[0][1:], telefone[0][3:]], [nome[2][0:], registro[2][1:], telefone[2:][3:]]]
print(busca('Contabilidade')) # [['Adalberto Ferreira', '66', ')84564-5248'], ['Flavia Amorim', '65', ()]]
print(busca('RH')) # [['Adalberto Ferreira', '66', ')84564-5248'], ['Flavia Amorim', '65', ()]]
print(busca('Setor inexistente')) # [['Adalberto Ferreira', '66', ')84564-5248'], ['Flavia Amorim', '65', ()]]
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