How does if statement work

In this case, it is the main block where execution of the program starts and the next statement is the print 'Done' statement. After this, Python sees the ends of the program and simply finishes up. Although this is a very simple program, I have been pointing out a lot of things that you should notice even in this simple program. There is no switch statement in Python. You can use an if.. A Byte of Python. The if statement Chapter 6. Control Flow. The if statement.

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All Rights Reserved. W3Schools is Powered by W3. They ask the program if something is true, and tell it what to do next based on the answer. If statements are formulaic to write. No matter what the scenario, they always follow a similar set pattern. You use logical operations to conditionally execute your desired actions. This is done simply by listing all the actions that need to be completed in the order you want them completed in. For example:. For example, one of your if statements sends some incoming data from your email to the correct database.

An expression that is considered to be either truthy or falsy. Statement that is executed if condition is truthy. Can be any statement, including further nested if statements. To execute no statements, use an empty statement. Statement that is executed if condition is falsy and the else clause exists.