SDSS Computing Studies Python Assignment

Assignment #005 Tuples and Lists (Total Marks 12)

Objectives:

• Understand the difference between a tuple and a list
• Convert between tuples and lists
• Find the length of a list or tuple
• Access specific elements in a list or tuple
• Add or insert an element into a list
• Remove elements from a list
• Sort a list
• Use math operators to join 2 lists
• Create new lists

Last class we introduced the concept of a tuple. A tuple is a collection of data that contains multiple elements. For example, it might contain information about the latitude and longitude of a location on a map: ''' location = (123.10012, -1.33321) '''

or a tuple might contain information about your student record: ''' me = ("Joe Luncbox","876561") '''

A tuple is an unordered collection of data, but can not be changed. The data in a tuple cannot be edited or deleted.

A list is similar to a tuple, but the data CAN be changed. See the file example1.py to see how tuples and lists differ.

A list is more flexible, because you can add or remove items from the list. The commands for adding to a list are done a bit differently from most of the commands that we have looked at thus far. example2.py will go through some of the commands involved in modifying a list

There are other imporant methods available when working with lists. example3.py will show you how we can sort() lists, count() the number of times that something appears, and find the index() of something that we are looking for inside a list.

XX Tasks

Task 1

Create a list that contains the following strings, in order: Cat Fish Dog Bear Turtle

Sort the list into alphabetical order and and then ask the user to enter a number corresponding to the index of an element. Print the element associated with that index.

(2 points)

Task 2

Create a variable that contains an empy list. Ask a user to enter 5 words. Add the words into the list. Print the list

(2 points)

Task 3

Sort the given list by numerical value Find the smallest and the largest value and display them. 1 mark will come from an assertion test (variables will be checked) and 1 mark will come from an input/output test

(2 marks)

Problem 1

Print the list named "people" Ask the user to enter a word from the list Ask the user to enter another word Replace the first word with the second word. (2 marks)

Problem 2

Print the list named "fruit". Ask the user to enter a word If the word is in the list, delete all occurrences of that word from the list If the word is not in the list, add the word to the list Print out the updated list (2 marks)

Problem 3

Ask the user to enter a maximum of 10 positive integers. After each entry, add the number to a list If the entry is -1 then stop adding numbers to the list Sort the list and display the highest number added (2 marks)