Menu system for python

def callmenumain(): #This will be a way to call upon the main menu from any submenu that uses "callmainmenu()"
    print("""#Lets show the user the options
====Menu====
1]Submenu 1
2]Submenu 2
3]Submenu 3
============""")
    selectinput=input("Select an input number from the menu:\n")
    if selectinput=="1":
            callsubmenu1()#Defined somewhere else in the code
    elif selectinput=="2":
            callsubmenu2()#Defined somewhere else in the code
    elif selectinput=="3":
            callsubmenu3()#Defined somewhere else in the code
callmainmenu()#At the very end of the code, put this so the code will run through the menu system