Python Programming Using multiple functions

Question

Hey im new to python and my teacher wants us to create a function with multiple functions. Here is what my program looks like

def main():
    carpetyards = float(input("Enter amount of yards the carpet is"))
    carpetcost = 5.50 * carpetyards
    fee = carpetcost + 25.00
    tax = .06 * fee
    totalcost = fee + tax  
results() 

def results():
    print()
    print('carpetyards    :' , format (carpetyards))
    print('carpetcost     :' , format (carpetcost, '9,.2f'))
    print('fee            :' , format (fee,        '9,.2f'))
    print('tax            :' , format (tax,        '9,.2f'))
    print('totalcost      :' , format (totalcost,  '9,.2f'))   

main()

I get either nameerror or results is not defined error. Can someone please help?

You're calling it too early, put the function call after the function's definition. — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Feb 9, 2014 at 21:28
Ask your teacher about variable scope. Also, indent results(). — rlms
– rlms, Commented Feb 9, 2014 at 21:28
Ok I tried that and its asks the question but then nothing happens — user3290698
– user3290698, Commented Feb 9, 2014 at 21:31
Ok and now I just changed it again and got this: print('carpetyards :' , format (carpetyards)) NameError: global name 'carpetyards' is not defined — user3290698
– user3290698, Commented Feb 9, 2014 at 21:33

hydronium · Accepted Answer · 2014-02-09 21:31:06Z

1

The line at the end of main() (results()) is not indented, so it the program does this:

Define main()
Run results()
Define results()
Run main()

As you can see, there will be several errors, because you are not only running results() before it is defined, but the variables used in results() (which are set in main()) are out of its scope (variables set in main() only work inside main() unless you make them global).

answered Feb 9, 2014 at 21:31

hydronium

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Comments

rae1 · Accepted Answer · 2014-02-09 21:30:25Z

0

You need to define results inside the main function for this to work,

def main():
   carpetyards = float(input("Enter amount of yards the carpet is"))
   carpetcost = 5.50 * carpetyards
   fee = carpetcost + 25.00
   tax = .06 * fee
   totalcost = fee + tax  

   # 'main' function scope
   def results():
     print()
     print('carpetyards    :' , format (carpetyards))
     print('carpetcost     :' , format (carpetcost, '9,.2f'))
     print('fee            :' , format (fee,        '9,.2f'))
     print('tax            :' , format (tax,        '9,.2f'))
     print('totalcost      :' , format (totalcost,  '9,.2f'))   

   results() 

# outer scope
main()

You could further define other functions inside main as long as you properly indent them.

answered Feb 9, 2014 at 21:30

rae1

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1 Comment

SethMMorton Over a year ago

I disagree. You can define results inside main, but you don't need to. results can be defined outside main, it just needs to be defined before it is used.

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