person = {"vorname":"John","nachname":"Doe","alter":18}

print(person["vorname"])

planeten = {
    "Merkur": {"Masse":1000, "Durchmesser":2000},
     "Venus": {"Masse":1000, "Durchmesser":2000},
     "Erde": {"Masse":1000, "Durchmesser":2000},
     "Mars": {"Masse":1000, "Durchmesser":2000}

}

print(planeten["Mars"]["Masse"])


messwerte = [{"Druck":900, "Temp":23},{"Druck":900, "Temp":23} ]