ENSF592- Assignment 3 Solved

Learning Outcomes
Accept user input through varied menu options
Validate user input through exception handling
Process data according to specifications
Iterate through varied values using compound data types
Manipulate strings and apply regular expressions
Develop and implement user-defined classes
Print formatted output according to given specifications
💻 Program Specifications
A cipher is an algorithm used for encrypting or decrypting information. You are being asked to design a terminal-based application for encoding and decoding text based on a provided cipher algorithm. Your application must meet the following design specifications:

Your user interface should prompt the user to input the following information:
Whether they would like to encode or decode their text
Enter their text to be encoded/decoded
Enter their cipher
You may prompt for the input to be entered in any form or order you like, but be sure to give the user clear instructions.
You must validate that the provided cipher is exactly 26 elements long and only contains lowercase characters from a to z or digits from 0 to 9.
If the cipher does not meet the criteria, you must handle a ValueError exception by providing a message back to the user and allow them to re-enter their cipher without terminating the program.
Any entered string is valid for encoding/decoding, however:
Any punctuation/spaces/etc. within the text should be removed- only letters are encoded/decoded.
The resulting coded or decoded message must be all lowercase letters with no spaces in between.
Your code should include and use at least two classes of your own creation, at least three user-defined functions aside from __init__ or main(), at least one iterable object, and at least one regular expression.
Your code must follow the conventions discussed so far in the course (nameswithunderscores, ClassNames, four spaces for indentations, spaces between variables/operators, comments throughout, etc.)
All classes and functions must contain docstring documentation.
Your code will be run by the TAs as your end user.
FAQs about the assignment will be answered on the D2L discussion boards. Please check the boards for any clarifications before submitting.
The grading rubric will be posted to D2L.
Example Tests
Text to be encoded: “abcde”
Cipher: “bcdefghijklmnopqrstuvwxyza”
Code result: “bcdef”

Text to be decoded: “abcde”
Cipher: “bcdefghijklmnopqrstuvwxyza”
Code result: “zabcd”

Text to be encoded: “Tell me and I forget. Teach me and I remember. Involve me and I learn. - Benjamin Franklin”
Cipher: “bcdefghijklmnopqrstuvwxyza”
Code result: “ufmmnfboejgpshfuufbdinfboejsfnfncfsjowpmwfnfboejmfbsocfokbnjogsbolmjo”

Text to be decoded: “uifcftuboenptucfbvujgvmuijohtjouifxpsmedboopucftffopsfwfoupvdifeuifznvtucfgfmuxjuiuififbsuifmfolfmmfs”
Cipher: “bcdefghijklmnopqrstuvwxyza”
Code result: “thebestandmostbeautifulthingsintheworldcannotbeseenoreventouchedtheymustbefeltwiththehearthelenkeller”

📝 Assignment Tasks
Make sure to watch video lessons 8 - 14 and review the corresponding Jupyter Notebooks and lab sessions.
Clone this repository to your local computer.
Open VSCode and start a new terminal. Make sure that your ensf592 environment is activated.
encryption.py is provided as a starting point. Fill in the header with your own information.
Remember to test your program execution via the terminal: python encryption.py
Take a screenshot of your successful program run and upload it to your assignment repository.
Commit your screenshot and code.
Push your local git history to github: git push origin main
Submit your repository HTTPS link to the Assignment 3 D2L dropbox.
Tip: If you want to learn more about a specific aspect of a Python object, remember to take a look at the official documentation!