Working with Lists

In earlier chapters we worked with lists of numbers as shown below.

But a list in Python can also hold different types of things in the same list, like numbers and strings. You start and end a list with square brackets ([]) and separate elements with commas as shown in line 1 below. The function len will return the number of items in the list. You can do “arithmetic” with lists using * and +, just like you can with strings. Multiplication repeats items in the list. We can add two lists together, even if one of the lists only has a single item in it.

Activity: CodeLens 2 (Simple_Lists)


Remember that a list starts with a [ and ends with a ]. Items in the list are separated by commas.

Run the code below to see what type of error you get if you forget the ending ] as shown below on line 1. Also see what happens if you don’t separate the list items with commas as shown on line 2. Fix the code to run and print.

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