CS177 LAB 2 - Purdue University



CS177 LAB 5

Before the Lab

Study Chapter 5 of the textbook.

Setting up your Environment

Go to your working directory in “data.cs.purdue.edu” and create a directory “cs177/lab05”. Refer to the first lab or the other handouts on the course page if you need to remember the steps to do so. Then start the IDLE Python Interpreter.

Exercise 1

Complete the following program to display the output expected by replacing every “?” string with an appropriate string or list function (e.g. s[0]). Do not use string constants (e.g. “Hello World”).

|# |

|# lab5-1.py: |

|# Complete the following program to print the desired output. |

|# |

|def Main(): |

|s = "I love Python Programming." |

|y = " Yes!" |

|print() |

|print("Char at index 10 of s:", "?") |

|print() |

|print("Chars 2 to 5 inclusive of s: ", "?") |

|print() |

|print("Last character of s:", "?") |

|print() |

|print("Length of s:", "?") |

|print() |

|print("s repeated 3 times:", "?") |

|print() |

|print("s concatenated with y:", s + y) |

|print() |

|#You are not allowed to just type in the new sentence, manipulate the given string s. |

|print("I love Programming Python: ", "?") |

|print() |

| |

|l=["Sunday", "Monday", "Tuesday", |

|"Wednesday", "Thursday", "Friday", "Saturday"] |

| |

|print("Weekdays:", "?") |

|print() |

|print("Weekend:", "?") |

|print() |

|print("Two weeks:", "?") |

|print() |

|print("Days of the week:") |

|for i in range(len(l)): |

|print("?") |

| |

|Main() |

This is the expected output:

|Char at 10 of s: h |

| |

|Chars 2 to 5 inclusive of s: love |

| |

|Last character of s: . |

| |

|Length of s: 26 |

| |

|s repeated 3 times: I love Python Programming.I love Python Programming.I love Python Programming. |

| |

|s concatenated with y: I love Python Programming. Yes! |

|I love Programming Python: I love Programming Python |

| |

|Weekdays: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'] |

| |

|Weekend: ['Sunday', 'Saturday'] |

| |

|Two weeks: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday', 'Monday', 'Tuesday', |

|'Wednesday', 'Thursday', 'Friday', 'Saturday'] |

| |

|Days of the week: |

|0 : Sunday |

|1 : Monday |

|2 : Tuesday |

|3 : Wednesday |

|4 : Thursday |

|5 : Friday |

|6 : Saturday |

Save the program in cs177/lab05/mystring.py.

Exercise 2

Write a program that will generate 5 random sentences. The random sentences will be built using one component from each of the following lists:

subjects + verbs + objects + endings

where:

subjects=['I','You','Bob','John','Sue','Kate',

'The lizard people']

verbs=['will search for','will get',

'will find','attained','found',

'will start interacting with',

'will accept','accepted']

objects=['Billy','an apple','a Triforce',

'the treasure','a sheet of paper']

endings=['.',', right?','.',

', like I said.','.',', just like you.']

(Lists based on the sentence generator in )

You can use the function:

from random import *

s = choice(subjects)

print s

where choice will choose a random component from the sequence “subjects”.

Your program should print 5 random sentences.

Example:

|>>> |

|Sue will accept a Triforce . |

|I attained a sheet of paper , like I said. |

|Sue accepted the treasure . |

|John will get the treasure , just like you. |

|Kate will get Billy , just like you. |

|>>> |

Save the program in cs177/lab05/sentences.py.

Exercise 3

Given the following lists of colors and fruits, write a program that generates all possible combinations. Hint: Use two nested for loops.

fruits = [ "apple", "strawberry", "banana", "pear", "watermelon", "tomato"]

color = ["green", "red", "blue", "orange", "pink", "violet"]

Example output:

>>>

green apple

red apple

blue apple

orange apple

pink apple

violet apple

green strawberry

red strawberry

blue strawberry

orange strawberry

pink strawberry

violet strawberry

green banana

red banana

blue banana

…

Save the program in cs177/lab05/combinations.py.

Turnin your project

Run PuTTY and login to data.cs.purdue.edu.

Turn in your lab by typing:

cd cs177

turnin –v –c cs177 –p lab05 lab05

(Remember that the final “lab05” is the name of your folder.)

Lab5 Grading Form

Name: ___________________________________

Login: ___________________________________

| |Max |Current |

|Exercise 1 |30 | |

|Submission (7) | | |

|-2 points for every wrong question | | |

|Heading and comments (3) | | |

|Exercise 2 |30 | |

|Submission (7) | | |

|Generate random sentence (10) | | |

|Print 5 sentences (10) | | |

|Heading and comments (3) | | |

|Exercise 3 |30 | |

|Submission (6) | | |

|Use for loops (10) | | |

|Print all combinations (10) | | |

|Heading and comments (4) | | |

|Attend your Scheduled Lab |10 | |

|Total: |100 | |

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