countries_capitals = {'Poland': 'Warsaw', 'Germany': 'Berlin'}

countries_capitals['Czechia'] = 'Prague'

#print(countries_and_capitals)

for key in countries_capitals.keys():
    print(key)

print(countries_capitals["Poland"])
print(countries_capitals.get("Poland"))

print(countries_capitals.setdefault(("USA", "Washington DC")))

if "Poland" in countries_capitals.keys():
    print("Znaleziono!")
else:
    print("Nie znaleziono!")