Assignment 3
Reading
Read the following sections in Introduction to Computing using Python: An Application Development Focus, Second Edition by Ljubomir Perković:
1. 4.2 - Formatted output
2. 4.1 - Slicing
3. 4.1 - String functions
4. 4.3 - file I/O
5. debugging (case study starting on page 471)
6. 4.4 - Exceptions
Logistics
Please document any collaboration relevant to this assignment, in the header comment of the source file, as described in the first assignment.
Complete the problems described below and upload your version of the solutions to the submission folder named ‘Homework 3’, in D2L.
Assignment
Implement the functions below in the file csc401-homework3.py which can be found on the D2L site in the Week 3 folder. You should save the template file I provided and then modify that file by adding the bodies for the functions. When you do, make sure to remove the placeholder pass statements that are currently there.
A note about the built-in tests: these should not be your only testing. I will test your code with other inputs besides those shown in the test and your code should still
work if I have used valid values.
1. Implement a function named print_columns(data) that takes 1 parameter:
a. data - a list contains strings, each string representing a data record
Each record represents a name, a price and a total number of items purchased as a single comma-separated string.
The exercise is to:
a. split the record into its 3 parts
b. convert the data where necessary (price should be a float and number of items an integer).
c. Trim the name field to just the first 4 characters
d. Calculate the total for each line ( cost multiplied by items)
e. print out the records formatted as below:
Name Cost Items Total
|
Laai |
208.10 |
10 |
2081.00 |
|
Arno |
381.00 |
9 |
3428.99 |
|
Sion |
327.01 |
1 |
327.01 |
|
Shay |
429.50 |
2 |
859.00 |
|
Rene |
535.29 |
4 |
2141.16 |
Name : left justified in 20 places
Cost : right justified in 6 places, 2 decimal places Items : right justified in 6 places
Total: right justified in 8 places, 2 decimal places
Some fiddling with the headers, spaces between the captions may be necessary. Names should line up under “Name”, costs should line up under “Cost”, totals should line up under “Total”.
Examples:
>>> print_columns(sample_data)
|
Name |
Cost |
Items |
Total |
|
Laai |
208.10 |
10 |
2081.00 |
|
Arno |
381.00 |
9 |
3428.99 |
|
Sion |
327.01 |
1 |
327.01 |
|
Shay |
429.50 |
2 |
859.00 |
|
Rene |
535.29 |
4 |
2141.16 |
Notes
1. The test data sample_data is in csc401-homework3.py already.
2. The captions are all left justified
3. Write a function scan_for(file_name, word) that takes 2 string parameters:
file_name - a string representing a file name
word – a word to scan for in the file
The function reads the file and prints the number of occurrences of the specified word that exist in the file, in the format displayed below in the example output.
The function must ignore any of these punctuation marks: . ! ?
That is, ‘cat’ and ‘cat?’ are 2 instances of ‘cat’. You are permitted to remove the punctuation from the text
The following is sample output using a file available with the homework template:
>>> scan_for('shoes.txt', 'I')
The word I appears 5 times in shoes.txt
>>> scan_for('shoes.txt', 'shoes')
The word shoes appears 3 times in shoes.txt
>>> scan_for('shoes.txt', 'tree')
The word tree appears 0 times in shoes.txt
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