Even though in Portugal there are nationwide holidays, others are regional or municipal (depending on the city).

If one runs the following script, to access the holidays in Portugal plus extended days most people have off:

from datetime import date
import holidays
for date, name in sorted(holidays.PTE(years=2020).items()):
    print(date, name)

One gets the following list:

2020-01-01 Ano Novo
2020-02-25 Carnaval
2020-04-10 Sexta-feira Santa
2020-04-12 Páscoa
2020-04-25 Dia da Liberdade
2020-05-01 Dia do Trabalhador
2020-06-10 Dia de Portugal
2020-06-11 Corpo de Deus
2020-06-13 Dia de Santo António
2020-08-15 Assunção de Nossa Senhora
2020-10-05 Implantação da República
2020-11-01 Dia de Todos os Santos
2020-12-01 Restauração da Independência
2020-12-08 Imaculada Conceição
2020-12-24 Véspera de Natal
2020-12-25 Dia de Natal
2020-12-26 26 de Dezembro
2020-12-31 Véspera de Ano Novo

I have seen that the general/national holidays for Portugal are missing, here is its list:

As one can see, it is slightly different than the one above, as the first one considers some municipal holidays. Here is a detailed list of the holidays in Portugal, in their specific months.