For Loops

Lesson

Control flow statements

• Change the way your code runs
• Different control flow statements allow you to repeatedly run the same block of code over and over, or even not run it at all!
• For loops are one type of control flow statement
• If/else statements are another type (which we will discuss later)

For loops

• Write something once, then execute it over and over!
• You have to know before you run a for loop how many times it will run

Syntax

• Line 1: for {loopVariable} in {loopList}:
  • {loopVariable} is an element of the list
  • {loopList} is the list to cycle through
• Line 2+: tab, then statement to loop over

The len() Function

• This gives the length of a list
• Use this when cycling through a list! For an example, see Example 4 in the Playground!

Playground