In programming, we often ask yes or no questions, and decide to do something based on the answer. For example, we might ask, “Are you older than 20?” and if the answer is yes, respond with “You are too old!”
These sorts of questions are called conditions, and we combine these conditions and the responses into
if statements. Conditions can be more complicated than a single question, and
if statements can also be combined with multiple questions and different responses based on the answer to each question.
In this chapter, you’ll learn how to use if statements to build programs.
An if statement might be written in Python like this:
>>>age = 13
ifage > 20:
'You are too old!')