pico menu, Python 3

pico menu

menuTree={"Main":    {"Options":["Sensor 1","Sensor 2","Heater 1","Heater 2","Mixer","Pressure"],"Position":0},
          "Sensor 1":{"Options":["View","Calibrate","Set actions"],"Position":0},          
          "Sensor 2":{"Options":["View","Calibrate","Set actions"],"Position":0}
          }
          
currentMenu="Main"
          
def printMenu(title,action):
    if menuTree[title]:
        if action=="up":
            menuTree[title]["Position"]=menuTree[title]["Position"]+1
        elif action=="down":
            menuTree[title]["Position"]=menuTree[title]["Position"]-1
        menuTree[title]["Position"]=menuTree[title]["Position"]  %  len(menuTree[title]["Options"])
        if action=="select":
            currentMenu=menuTree[title]["Options"][menuTree[title]["Position"]]
            menuTree[title]["Position"]=0
            printMenu(currentMenu,0)
        else:
            print(title)
            print("  ",menuTree[title]["Options"][menuTree[title]["Position"]-1])
            print(" *",menuTree[title]["Options"][menuTree[title]["Position"]])
            print("  ",menuTree[title]["Options"][menuTree[title]["Position"]+1])
        
printMenu("Main",0)
print() 
printMenu("Main","up")
print()
printMenu("Main","select")


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