Python for loops: repeat code for each item

A for loop runs the same lines of code once for each item in a sequence, so you write the instruction once instead of many times.

How it works

Each time round the loop, the name after for holds the next item, and the indented lines below it run. The loop stops when the items run out.

• range(1, 6) gives the numbers 1 to 5. The end number is left out.
• A list such as fruits gives its items one at a time, in order.
• Indentation matters: only the indented lines belong to the loop.

Try changing it

• Change range(1, 6) so it counts to 10.
• Add another fruit to the list and run the cell again.
• Change the last example so it adds up your own prices.

A common mistake

Forgetting the indentation, or the colon at the end of the for line, gives an error. Python needs both to know which lines to repeat.