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(action):
    global currentMenu
    if currentMenu in menuTree:
        if action=="up":
            menuTree[currentMenu]["Position"]=menuTree[currentMenu]["Position"]+1
        elif action=="down":
            menuTree[currentMenu]["Position"]=menuTree[currentMenu]["Position"]-1
        elif action==0:
            menuTree[currentMenu]["Position"]=0

menuTree[currentMenu]["Position"]=menuTree[currentMenu]["Position"]  %  len(menuTree[currentMenu]["Options"])
        if action=="select":
            currentMenu=menuTree[currentMenu]["Options"][menuTree[currentMenu]["Position"]]
            printMenu(0)
        else:
            print(currentMenu)
            print("  ",menuTree[currentMenu]["Options"][menuTree[currentMenu]["Position"]-1])
            print(" *",menuTree[currentMenu]["Options"][menuTree[currentMenu]["Position"]])
            print("  ",menuTree[currentMenu]["Options"][menuTree[currentMenu]["Position"]+1])
    else:
        print (" Doing action ",currentMenu)
        
printMenu(0)
print() 
printMenu("up")
print()
printMenu("select")
print() 
printMenu("up")
print()
printMenu("select")


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