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Discrete Structures

Tuple Swapping

Project Goals

This assignment invites you to run and observe one Python program called perform-ordered-pair-swap. Instead of using the Poetry tool for managing dependencies and packaging these programs, which the technical skills advise as a best practice, this program is a script, without any dependencies on other Python packages, that you can run through the Python interpreter. As you continue to practice a different way to run a Python program, this project invites you to explore how to (i) find and fix defects in a function and (ii) create and use fixed-size tuples that can contain arbitrary types of data.

Project Access

If you are a student enrolled in a Computer Science class at Allegheny College, you can access this assignment by clicking the link provided to you in Discord. Once you click this link it will create a GitHub repository that you can clone to your computer by following the general-purpose instructions in the description of the technical skills. Specifically, you will need to use the git clone command to download the project from GitHub to your computer. Now you are ready to add source code and documentation to the project!


If you are an emerging proactive programmer who is not enrolled in a Computer Science class at Allegheny College, you can still work on this assignment! To get started, you should click the "Use this template" icon in the data-types-starter GitHub repository and create your own version of this project's source code. After creating your GitHub repository, you can follow all of the other steps!

Code Survey

If you change into the source directory of your GitHub repository, you will see a Python program called Your goal for this project is to find and fix the defects in the function with the signature def ordered_pair_swap(pair_one: Tuple[Any, Any], pair_two: Tuple[Any, Any]) -> Tuple[Tuple[Any, Any], Tuple[Any, Any]]. When you run the command python after correcting the program's defects, it should produce the following output:

Original tuple of ordered pairs: (('A', 1), ('B', 2))
Swapped tuple of ordered pairs: ((2, 'B'), (1, 'A'))
Swapped (again) tuple of ordered pairs: (('A', 1), ('B', 2))

It is worth noting that the ordered_pair_swap function performs two types of swapping. It first swaps the values inside of each of the ordered pairs, as evidenced in the first and second lines of the output, where the first tuple is input as ('A', 1) and output as (1, 'A'). The second type of swap performed by the function involves outputting the second tuple first and the first tuple second, which the second output line illustrating with ((2, 'B'), (1, 'A')) for an input of (('A', 1), ('B', 2)). The final line of the program output also illustrates that the tuple swapping process is reversible since the function can accept as input ((2, 'B'), (1, 'A')) and produce as output (('A', 1), ('B', 2)) — which is the original tuple that started this the tuple swapping process!

Running Checks

Since this project does not use Poetry to manage project dependencies and virtual environments, it does not support the use of commands like poetry run task test. However, you can leverage the relevant instructions in the technical skills to run the command gatorgrade --config config/gatorgrade.yml to check your work. If gatorgrade shows that all checks pass, you will know that you made progress towards correctly implementing and writing about this project's program.


Did you know that GatorGrade and GatorGrader are open-source Python programs implemented by many proactive programmers? If you finish this source code survey and have extra time, please brainstorm some new features that you think these two tools should have, explain your idea by raising an issue in the relevant project's GitHub repository, and take the first step towards implementing and testing your idea. If the maintainers of these tools accept your new feature then you will have helped to improve the experience of other people who use GatorGrade and GatorGrader!

Project Reflection

Once you have finished all of the previous technical tasks, you can use a text editor to answer all of the questions in the writing/ file. Since this is a source code survey, you should provide output from running each of the provided Python programs on your own laptop and then explain how the program's source code produced that output. A specific goal for this project is for you to improve and document the source code of a function that indexes a tuple in order to swap its contents.

Project Assessment

Since this project is source code survey, it is aligned with the remembering and understanding levels of Bloom's taxonomy. You can learn more about how a proactive programming expert will assess your work by examining the assessment strategy. From the start to the end of this project you may make an unlimited number of reattempts at submitting source code and technical writing that meet the project's specification.

Seeking Assistance

Emerging proactive programmers who have questions about this project are invited to ask them in either the GitHub discussions forum or the Proactive Programmers Discord server. Before you ask your question, please read the advice concerning how to best participate in the Proactive Programmers community. If you find a mistake in this project, please describe it and propose a solution by creating an issue in the GitHub Issue Tracker.

Updated: 2023-02-24   Created: 2021-09-16
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