Lecture 31 – Practice Exercises 7

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Presentation transcript:

Lecture 31 – Practice Exercises 7 CMPT 120 Lecture 31 – Practice Exercises 7

Goals for Today! Exploring Lists of Lists -> good prep for our Assignment 2 Exploring File I/O -> also good prep for our Assignment 2 Practising Selection and Insertion Sort

Question 1 – Exploring Lists of Lists Have a look at this code https://repl.it/repls/FuzzyGlitteringTexts What does it do? Add code to it to … Create a few more floor patterns Put the string 'MM' at the centre of the first floor pattern Hint: Put the string in the ‘list of lists’ variable aFloor Printing: how differently would these three Python code fragments print the content of the ‘list of lists’ aFloor print(aFloor) for row in range(theHeight): print(aFloor[row]) the function def printFloor(theFloor, theHeight):

Question 1 – Exploring Lists of Lists (cont’d) Imagine you are an interior decorator and would like to see what the floor plan would look like if you were to place a sofa on the east edge of the room Create a function that places a sofa (2 cells deep by 6 cells long), i.e., the string 'SS' along the right-hand side edge of the floor Remember: The cells are 2-character wide and 1-character high

Question 2 – Exploring File I/O a) Have a look at the 5 demos in this code https://repl.it/repls/IllSomePasswords What do they do? b) Problem Statement: Write a Python program that reads the file words.txt found here: http://greenteapress.com/thinkpython2/code/words.txt and prints only the words it contains that have more than 20 characters (not counting whitespace and newline character) Our Python program must print one word per line

Question 3 – a) Selection Sort Visualize the execution of the Selection Sort using https://visualgo.net/en/sorting Once you have a good idea how Selection Sort works, sort the following data: 3,38,5,47,15,36,26,27,2,4,19 using Selection Sort and write down what the unsorted section of the data looks like once 3 iterations of Selection Sort have executed, in order words, once data has 2,3,4 in its sorted section: 2,3,4,____________________________

Question 3 – b) Insertion Sort Visualize the execution of the Insertion Sort using https://visualgo.net/en/sorting Once you have a good idea how Insertion Sort works, sort the following data: 3,38,5,47,15,36,26,27,2,4,19 using Insertion Sort After 3 iterations of Insertion Sort, does the unsorted section of data look the same as in your answer to Question 3 a)? Does the sorted section of data look the same?