Learn Python: Step-by-Step by Ambli Shreeharsh

Author:Ambli, Shreeharsh [Ambli, Shreeharsh]
Language: eng
Format: epub, pdf
Published: 2020-05-26T16:00:00+00:00

def add ( user_input ):

return user_input[ 0 ] + user_input[ 1 ]

def display_result ( inputs , result ):

print ( ' {} + {} = {} ' .format(inputs[ 0 ], inputs[ 1 ], result))

display_app_header( 'Addition program' )

user_input = get_user_inputs()

result = add(user_input)

display_result(user_input, result)

Notice get_user_inputs(). We need to get the user inputs properly converted to numbers & both the nos. returned so that the next function can use the inputs. To do so, we have used a list. A list is a structure used to store multiple data items. In this case, we are storing 2 different nos.

We first let Python know that the variable result is a list by using this syntax:

result = []

We can now add data to this list by calling append(), like so:

result.append( float (firstNo))

Finally, we return the list so that other functions can use the same for further processing:

return result

add() uses this list to add the supplied nos. & returns the result:

return userInput[ 0 ] + userInput[ 1 ]

It does this by using an index. Index basically lets us point to a particular item in a list & it starts with 0. So to point to the first number we use:

userInput[ 0 ]

The resulting program is a little longer but is more readable. If there are any issues or bugs (wrong code), we can easily go to that particular function & fix without reading the entire program to search.

The e.g. problem of adding two numbers has got us thus far. To learn more we need to switch our problem to a more complex one so that we can leverage other language features. We will next build a program to display the multiplication table for a given no.

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