If Conditions

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Previous Lesson

In Python, you can ask the computer to make decisions based on events. This is similar to deciding which shirt to wear on school picture day. If it’s school picture day, you have to wear a formal attire. If it isn’t school picture day, you can wear a casual attire. Here is an example below.

• If Condition Example

Notice how I used 2 equal signs. I did this because Python wants to differentiate between comparing things versus assigning variables. When assigning variables, you use one equal sign. When comparing things, you use two. 

Also notice how I gave 4 spaces after the if and else statements. This is to show that the next line after the if/else statement is part of that statement.

If you have an if statement where you want to do nothing if the statement is false, you don’t need the else statement as shown below.

•  If Condition Without Else 

The same way, if you have an if statement with many conditions. Then you can use elif statements to show that if the previous statement is false, you have an other statement that you can check. Else is only used when all previous statements are false.

•  If Condition With Elif