Reading 07: Exam 02

Everyone:

Next week, we will have Exam 02, which will cover scripting in Python with a focus on: data structures, functional programming, and concurrency and parallelism. This reading assignment is meant to prepare you for this exam and is based on the items in Checklist 02.

Because of the exam on Wednesday, March 5, there will be no homework for the upcoming week.

TL;DR¶

The focus of this reading is to allow you to review for Exam 02.

Readings¶

The readings for this week are:

Checklist 02

Quiz¶

This week, the reading is split into two sections: the first part is a short dredd quiz, while the second part involves four short Python scripts: translate1.py, translate2.py, translate3.py, and translate4.py.

To test these scripts, you will need to download the Makefile and test scripts:

$ git switch master                   # Make sure we are in master branch
$ git pull --rebase                   # Make sure we are up-to-date with GitHub

$ git checkout -b reading07           # Create reading07 branch and check it out

$ cd reading07                        # Go into reading07 folder

# Download Reading 07 Makefile
$ curl -LO https://www3.nd.edu/~pbui/teaching/cse.20289.sp25/static/txt/reading07/Makefile

# Download and execute scripts
$ make

Code Snippets¶

Record the answers to the following Reading 07 Quiz questions in your reading07 branch:

Translations¶

Given the following Unix pipelines, write Python scripts (ie. translateX.py) that accomplishes the same task.

translate1.py: grep -Po ':1\d*0:' /etc/passwd | wc -l
translate2.py: /bin/ls -ld /etc/* | awk '{print $4}' | sort | uniq
translate3.py: curl -sL http://yld.me/raw/fDIO | cut -d , -f 4 | grep -Eo '^M.*' | sort
translate4.py: cat /etc/passwd | cut -d : -f 7 | sort | uniq -c | sort -srn

Notes¶

No credit will be given for simply calling os.system or os.popen on the given pipeline.
You may use os.popen to read the output of a single command, but not for a pipeline.
Use functional programming, list comprehensions, or generator expressions whenever possible.
You do not need to do a literal translation (that is you don't have to replicate each portion of the pipeline); you just need to accomplish the same overall task and emit the same output.
Most of the scripts should only be 5 - 10 lines long.

Submission¶

To submit you work, follow the same process outlined in Reading 01:

#--------------------------------------------------
# BE SURE TO DO THE PREPARATION STEPS ABOVE
#--------------------------------------------------

$ cd reading07                        # Go into reading07 folder
$ $EDITOR answers.json                # Edit your answers.json file

$ ../.scripts/check.py                # Check reading07 quiz
Checking reading07 quiz ...
     Q01 0.20
     Q02 0.20
     Q03 0.20
     Q04 0.20
     Q05 0.20
     Q06 0.20
     Q07 0.20
     Q08 0.20
     Q09 0.20
     Q10 0.20
   Score 1.00 / 1.00
  Status Success

$ git add answers.json                # Add answers.json to staging area
$ git commit -m "Reading 07: Quiz"    # Commit work

$ $EDITOR translate1.py               # Edit your translate1.py file
$ $EDITOR translate2.py               # Edit your translate2.py file
$ $EDITOR translate3.py               # Edit your translate3.py file
$ $EDITOR translate4.py               # Edit your translate4.py file

$ make                                # Test all scripts
Testing translations ...
 translate1.py                            ... Success
 translate2.py                            ... Success
 translate3.py                            ... Success
 translate4.py                            ... Success

   Score 2.00 / 2.00
  Status Success

$ git add Makefile                    # Add Makefile to staging area
$ git add translate1.py               # Add translate1.py to staging area
$ git add translate2.py               # Add translate2.py to staging area
$ git add translate3.py               # Add translate3.py to staging area
$ git add translate4.py               # Add translate4.py to staging area
$ git commit -m "Reading 07: Scripts" # Commit work

$ git push -u origin reading07        # Push branch to GitHub

Acknowledgments¶

If you collaborated with any other students, or received help from TAs or AI tools on this assignment, please record this support in the README.md in the reading07 folder and include it with your Pull Request.

Pull Request¶

Remember to create a Pull Request and assign the appropriate TA from the Reading 07 TA List.

DO NOT MERGE your own Pull Request. The TAs use open Pull Requests to keep track of which assignments to grade. Closing them yourself will cause a delay in grading and confuse the TAs.