9.6 PRACTICE

Python List Practice Questions for Beginners

Chapter 9 Recap and Practice

Your programs can now keep many values in one place. Here is the chapter in one table:

You write	It does
`items = ["a", "b"]`	makes a list; `[]` is an empty list
`len(items)`	counts the items
`a + b`, `[0] * 3`	joins two lists, repeats a list
`items[0]`, `items[-1]`	the first item, the last item
`items[1] = "x"`	changes the item at index 1
`items[1:3]`	a slice: index 1 up to, not including, 3
`items[:3]`, `items[-2:]`	the first 3 items, the last 2 items
`items[::-1]`, `items[:]`	a reversed copy, a copy
`items.append(x)`	adds `x` at the end
`items.insert(0, x)`	adds `x` at index 0
`items.remove(x)`	removes the first `x`
`items.pop()`, `del items[0]`	removes by index (`pop()` gives the item back)
`x in items`	`True` when `x` is in the list
`items.sort()`, `sorted(items)`	sorts the list, gives a new sorted list
`min()`, `max()`, `sum()`	the smallest, the largest, the total
`items.count(x)`, `items.index(x)`	how many times, and where

And the errors to watch for: IndexError (an index past the end), ValueError (removing or finding a value that isn't there), and None (storing what append() or sort() gives back).

Practice questions

Use input() with no prompt text. The tests try several inputs, including the edges (like 0, or one more than the length of the list), so test your program with those too.

Python lists

70.Python Program to Create and Print a ListEasySolve
71.Python Program to Build a Seat List with + and *MediumSolve

List index

72.Python Program to Print the First and Last Item of a ListEasySolve
73.Python Program to Find the Day Name from Its NumberMediumSolve

List slicing

74.Python Program to Print the Top Three ScoresEasySolve
75.Python Program to Get the Last Few Temperatures from a ListMediumSolve

Add and remove items

76.Python Program to Add Items to a Shopping ListEasySolve
77.Python Program to Remove a Task by Its NumberMediumSolve

List tools

78.Python Program to Check If an Item Is on the MenuEasySolve
79.Python Program to Make a Class Marks ReportHardSolve

Lists hold your data in order. Next, you'll learn the for loop, which visits every item for you.