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日期:2019-05-06 11:16

159.171 Assignment 2 Page 1 of 5

159.171 - Assignment 2 – 2019

Worth: 12% of final mark

Due date: 6pm Friday, May 3rd

For all three programs:

use meaningful names for variables and functions.

add any comments you think will help explain what your program's doing.

Question 1: Monthly Tax Deduction Table (4 marks)

Write a program that calculates tax deductions from monthly earnings ranging from $1000 to

$2000. Display the results.

Tax deductions include:

PAYE (rate 18%): Pay as you earn

PAYE = Earnings * 18%

Student Loan Deduction (rate 12%): Student loan repayment

Repay 12% of every dollar earned over the repayment Threshold that is $1536 monthly.

Student Loan Deduction = (Earnings – Threshold) * 12%

For example, if you earn $1900 a month before tax, your repayment will be $43.68

(($1900 - $1536) * 12% = $43.68).

If you earn under the repayment threshold, no student loan deductions will be made from

your earnings.

KiwiSaver (rate 3%): Retirement saving scheme

KiwiSaver = Earnings * 3%

A person’s monthly net earnings will be the amount after deducting the above three deductions

from the raw earnings.

Net Earnings = Earnings – PAYE – Student Loan Deduction - KiwiSaver

159.171 Assignment 2 Page 2 of 5

An example of the layout formatting is shown below:

Earnings $ PAYE $ ST Loan Ded $ KiwiSaver $ Net Earnings $

1000 180 0 30 790

1100 198 0 33 869

1200 216 0 36 948

1300 234 0 39 1027

1400 252 0 42 1106

1500 270 0 45 1185

1600 288 7.68 48 1256.32

1700 306 19.68 51 1323.32

1800 324 31.68 54 1390.32

1900 342 43.68 57 1457.32

2000 360 55.68 60 1524.32

So, if a person earns $1400 per month, he/she must pay $252 for PAYE and $42 for KiwiSaver,

then the net amount he/she can get is $1106.

If a person earns $1800 a month, the deductions are $324 for PAYE, $31.68 for Student Loan

Repayment, and $54 for KiwiSaver, then the net amount he/she can get is $1390.32.

IMPORTANT

You MUST use nested for-loops, one inside the other.

If you just print out the lines using fixed numbers, like this:

print("1500 270 0 45 1185")

print("1600 288 7.68 48 1256.32")

you'll get zero marks.

Hints:

You can set the increment of the sequence numbers of earnings to 50 or 100.

Values should be formatted to 2 decimal places.

159.171 Assignment 2 Page 3 of 5

Question 2: Handling Text Files (4 marks)

Download the files-info.txt from Stream. This text file contains the results of the “ls -l”

command, which outputs file permissions, number of links, owner name, owner group, file size,

time of last modification, and file/directory name. files-info.txt is formatted with one file per

line. (An example is shown below.)

Your task is to read this text file, clean it up by removing the permissions, number of hard links,

owner, and the date/time of last modification in each line. Namely, each line should only contain:

owner group, file size, and file name. Take the above for an example, after removing, it should

look like: root 4096 ataka.

Then find and display following statistics:

Count the number of files

Count the number of file formats, and display these formats. The file format can be

determined easily through the extension name of the file that appears after the name of

the file, followed by a dot. For example, the name of a text file format ends with .txt, a zip

file format ends with .zip

Count the number of zip files, for example, files with the .zip extension are zip files

Count the number of files that are owned by the staff group. Check whether the owner

group is staff.

Count the number of files, which are in text format and are larger than 200,000. Then sort

the list of text files greater than 200,000, and display the top 5 largest text files, at least

the file name and size should be printed out.

The average size of files

159.171 Assignment 2 Page 4 of 5

Question 3: A File Information Explorer (4 marks)

Still use files-info.txt on Stream. For this question, you are to build a way of displaying a

random file information, finding files, replacing and saving a list of files that meet certain

requirements.

The program first displays a menu (something like that shown below) and carries out the

appropriate action depending on which letter the user types and then redisplays the menu:

***File Information Explorer ***

l – load

r – random file

s – search

fr – find and replace

fs – find then save

q – quit

l – load

Load a file. Prompt for the name of a file. If no name is input (e.g. if using input() and the

user presses the enter key), load from “files-info.txt”, otherwise load it from the specified

filename. files-info.txt is formatted with one file per line.

r – random file

Randomly pick a file and display it with permissions, owner, owner group, size,

date/time, and name.

s – search

Prompt for a string, and then search for and display all files whose name contains this

string. Search case-independently, and separate the files with a blank line. If the search

string is empty, exit the search and redisplay the menu.

fr – find and replace

Prompt for one string (the search pattern) and then a second (the replacement). Replace

all occurrences of the first string with the second.

fs – find then save

Find all files in a specified format, then save the results to a file.

First, asking the user to input the file format, e.g. File format: txt

Second, prompt for a filename, e.g. File name: textfiles.txt

Then, search and find all files in this specified format.

Finally save the results to the file inputted by the user (e.g. textfiles.txt), inserting

“\n” where appropriate. The results should include permissions, owner, owner group,

size, date/time, and name for each file.

q – quit

Quit the program

159.171 Assignment 2 Page 5 of 5

Some suggestions on getting started:

Get the menu going and then create a function for each of load, search, ... Initially, simply

put a print inside each function, e.g. for the search function, put print("You called

SEARCH"). You can test each command – it will simply print out a message.

Then get load going so you can load a text file into a list. First get the name of the file,

next open the file, then load the file into the list and close the file. Test that you have

valid entries by printing out the first two files.

Implement the random command next. If you import the random module, you'll find the

random.choice() method useful here. It returns a randomly chosen element from a list,

e.g. print(random.choice([1, 2, 3, 5, 9])) .

Finally implement the rest of commands separately.

Hints:

Don’t forget to add appropriate checks, e.g. to make sure files-info.txt has been loaded.

Each command could be in their own function. You can of course, create any additional

functions that will help to simplify or clarify your code.

What and how to submit

How: ALL submissions must be via Stream (not email) using the Assignment 2 submission link.

What: Submit your Python programs, each named with .py extensions. You should have

three .py files to submit, one for each question.

Do not submit Word documents (.doc or .docx) or .zip or .rar files.

Check:

that your files have a .py extension

that all programs display your name and your Massey Student ID number when starting.


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