Lesson 2 of 3

Lists and loops

Watch, read the card, then practise. Lists · For loops · List methods

Video coming soon

The video for this lesson is being recorded.

Meanwhile, the notes below and the 60-second cards cover the same ideas.

Lists
A list keeps several values in order, in one variable.
Remember: The first item is at position 0, not 1.
For loops
A for loop runs the same lines once for each item, so you don't repeat yourself.
Remember: Indent the lines that belong inside the loop.
List methods
Lists come with built-in methods to add, remove and sort items.
Remember: sort() changes the list itself and returns None.

Try the example in Code Lab

marks = [72, 85, 90]
print(marks[0], marks[-1], len(marks))

Lesson 2 of 3

Watch, read the card, then practise. Lists · For loops · List methods

Video coming soon

The video for this lesson is being recorded.

Meanwhile, the notes below and the 60-second cards cover the same ideas.

Lists
A list keeps several values in order, in one variable.
Remember: The first item is at position 0, not 1.
For loops
A for loop runs the same lines once for each item, so you don't repeat yourself.
Remember: Indent the lines that belong inside the loop.
List methods
Lists come with built-in methods to add, remove and sort items.
Remember: sort() changes the list itself and returns None.

marks = [72, 85, 90]
print(marks[0], marks[-1], len(marks))