Algorithms For Dummies

  Introducing Python for Algorithm Programming 

     79

You have a new function, 

DoSum()

. This function requires that you provide two 

arguments to use it. At least, that’s what you’ve heard so far. Type DoSum() and 

press Enter. You see an error message like this one:

TypeError

    Traceback (most recent call last)

in ()

----> 1 DoSum()

  

TypeError: DoSum() missing 2 required positional

    arguments: 'Value1' and 'Value2'

Trying 

DoSum()

 with just one argument would result in another error message. To 

use 

DoSum()

 ,you must provide two arguments. To see how this works, type 

DoSum(1, 2) and press Enter. You see the expected result of 

3

.

Notice that 

DoSum()

 provides an output value of 

3

 when you supply 

1

 and 

2

 as 

inputs. The 

return

 statement provides the output value. Whenever you see 

return

 

in a function, you know that the function provides an output value.