How do i create a menu using print statements? I want to be able to choose a number and based on what number i choose run that function

Question

def main():

    option=displaymenu()
    print(option)
    while option1 != 4:
        if option1 ==1:
            print("1234")
        elif option1==2:
            print("1")
        elif option1==3:
            print("joe")
        else:
            print("end")



def displaymenu():
    print("choose one of the following options")
    print("1.Calculate x to the power of N")  << this is supposed to be 
    print("2.Calculate factorial of N")
    print("3.Calculate EXP")
    print("4.Exit")
    option1=input("Please enter your choice here:")<<<  i want these print statements to act as a menu? how do I make it so when I input a number 1-4 It does this operation I input ?

I want this to be a input statement that when I input 1 it will do print 1234 as I coded in my main program... help ? why when I enter a 1 or 2 or 3 it does nothing but print "end" ..? help. main()

Answer 1

Your line option=displaymenu() will set option to None as you don't have a return statement at the end of your function. Add the following line to your function and it should work:

return int(option1)

Answer 2

You are not returning back option1 from displaymeny. Instead you are trying to access it in the main function:

 while option1 != 4:

This also means that option in the main function does not have any vaule.

Change your program to this:

def main():
option = -1 # Value to get the while loop started
while option != 4:
    option=displaymenu()
    if option ==1:
        print("1234")
    elif option==2:
        print("1")
    elif option==3:
        print("joe")
    else:
        print("end")



def displaymenu():
    print("choose one of the following options")
    print("1.Calculate x to the power of N")  << this is supposed to be 
    print("2.Calculate factorial of N")
    print("3.Calculate EXP")
    print("4.Exit")
    return input("Please enter your choice here:")<<<  i want these print statements to act as a menu? how do I make it so when I input a number 1-4 It does this operation I input ?

Also note that I moved the call to displaymeny inside the while loop. If you have it outside you will only get the menu once.