Question

So first let me say that I am a novice at Python and functions seem to be out of my comprehension for the moment but where I am having trouble is having 3 functions be able to call each other. Here is my code(yes I know it is terribly wrong but you should see where I am going):

def menu():
    count=gearboxes
    cost=subtotal
    return subtotal


def quantity():

    gearboxes=raw_input("How many gearboxes would you like to order? ")

    return menu()



def subtotal(cost):
    if (gearboxes<=10):
        cost=gearboxes*100.0
        print cost
    elif (gearboxes>10 and gearboxes<20):
        cost=(gearboxes-10)*80.0+1000.0
        print cost
    elif (gearboxes>20):
        cost=(gearboxes-20)*70.0+1000.0+800.0
        print cost
    else:
        print "wtf m8"

    return menu()

def summary():
    print "="*80
    print "%60s %20f %20f" % ("motors",count,cost)
    print "="*80


print quantity()
print subtotal(menu)
print summary(menu)

There is it and any help would be greatly appreciated if you could explain also kind of how functions call on each other.

Thanks!

fixed version(still working)

    def quantity():
        motors=raw_input("How many motors would you like to order? ")
        gearboxes=raw_input("How many gearboxes would you like to order? ")
        sensors=raw_input("How many sensor boards would you like to order? ")

        return int(motors),int(gearboxes),int(sensors)



   def subtotal(motors,gearboxes,sensors):

        if motors<=10 and gearboxes<=15:
            motorCost=motors*100
            gearboxCost=gearboxes*50
            sensorCost=sensors*66
            return motorCost, gearboxCost, sensorCost

        if motors>10 and motors<=20 and gearboxes>15 and gearboxes<=30:
            motorCost=(motors-10)*80+1000
            gearboxCost=(gearboxes-15)*40+750
            sensorCost=sensors*66
            return motorCost, gearboxCost, sensorCost

        elif motors>20 and gearboxes>30:
            motorCost=(motors-20)*70+1000+800
            gearboxCost=(gearboxes-30)*30+750+600
            sensorCost=sensors*66
            return motorCost, gearboxCost, sensorCost

    def summary(motors,gearboxes,sensors,motorCost,gearboxCost,sensorCost):
        print "="*80
        print "%60s %20d %20d" % ("motors",motors,motorCost)
        print "%60s %20d %20d" % ("gearboxes",gearboxes,gearboxCost)
        print "%60s %20d %20d" % ("sensor boards",sensors,sensorCost)
        print "="*80


   def menu():

        a,b,c=quantity()
        d,e,f=subtotal(a,b,c)
        summary(a,b,c,d,e,f)
        return


    menu()

Answer 1

I made some changes to your code. Treat a function like a question. When you call the function; you’re asking the question. What you pass to return is the answer to the question. So when someone asks for the subtotal of some number of gearboxes; we return cost, whatever that may be.

We can then store the return values (the answers) in variables and use them later. For example, to pass to another function. Try to follow how information flows through the program.

def quantity():
    count=raw_input("How many gearboxes would you like to order? ")
    return int(count)



def subtotal(count):
    if count<=10:
        cost=count*100.0
        return cost
    elif count>10 and count<20:
        cost=(count-10)*80.0+1000.0
        return cost
    elif count>20:
        cost=(count-20)*70.0+1000.0+800.0
        return cost

def summary(count, cost):
    print "="*80
    print "%60s %20f %20f" % ("motors",count,cost)
    print "="*80

def menu():
    items = quantity()
    sub = subtotal(items)
    summary(items, sub)

if __name__ == '__main__':
    menu()