13.1. Using Decisions with Strings¶
We can use conditional statements in code to produce different strings for different situations and to treat different strings in different ways. As a first example, here is a program that prints a different message depending on how many item(s) a person orders. Try this program a few times and enter different values for the input.
In the program, notice that we have to use the
int function to turn the input from a string
into an integer. Anytime we use
input to get some input from the user, it will be read as
a string. If the user types
20, that will be stored by Python as the string
"20" and not
as the numeric value 20. Any time we get input, if we want to work with it as a number and not
as a string (a piece of text that may have digits in it) we will need to use this trick.
Similarly, when we go to construct the string that is the elif response, we are trying to combine
"You ordered " with
numItems a number. As we have seen before, to make this
work, we need to call the
str function to make a string out of the number that can be added
to the other strings.