[New Concept Exercise] : other-comprehensions

[BethanyG]

This issue describes how to implement the other-comprehensions concept exercise for the Python track.

Getting started

Please please please read the docs before starting. Posting PRs without reading these docs will be a lot more frustrating for you during the review cycle, and exhaust Exercism's maintainers' time. So, before diving into the implementation, please read up on the following documents:

• Contributing to Exercism | Exercism and GitHub | Contributor Pull Request Guide
• What are those Weird Task Tags about?
• Building Language Tracks: An Overview
• What are Concepts?
• Concept Exercise Specifications
• Concept Specifications
• Exercism Formatting and Style Guide
• Exercism Markdown Specification
• Reputation

Goal

The goal of this exercise is to teach the syntax and variants of set comprehensions and dict comprehensions in Python.

Learning objectives

• Understand how set and dict comprehensions relate to their underlying data structures and the loop + append method of creating/computing them.
• Create a dict comprehension from a loop + append
• Create a set comprehension from a loop + append
• Create a dict comprehension from Lists, Sets, Tuples, or other iterables (such as zip() or dict.items())
• Create a set comprehension from Lists, Sets, Tuples, or other iterables (such as zip() or dict.items())
• Use one or more conditions/operators/methods to filter comprehension inputs
• Use methods or logic to format the elements (output members) of the comprehension
• Create a nested comprehension (of either flavor)
• Create a nested comprehension (of either flavor) with one or more formatting or filtering conditions

Out of scope

• Memory and performance characteristics and optimizations
• generators and generator expressions in other comprehensions
• using the data structures in collections in combination with, or as part of a set or dict comprehension.
• Using the assignment expression (walrus operator) with either flavor of comprehension.

Concepts

• dict-comprehensions
• set-comprehensions
• comprehension syntax

Prerequisites

• basics
• bools
• conditionals
• comparisons
• loops
• iteration

Resources to refer to

• List Comprehensions (Python official docs)
• Nested List Comprehensions (Python official docs)
• Comprehending Python's Comprehensions (Dan Bader)
• List and Dict Comprehensions in Python (Timothy Bramlett)

Hints

• List Comprehensions section of the Python docs tutorial: List Comprehensions
• This animated GIF from Trey Hunner: List Comprehensions: The Movie

After

• comprehension syntax for other data structures such as sets and dictionaries
• generators and generator expressions
• generators and generator expressions in list comprehensions

Representer

No changes required.

Analyzer

No changes rquired.

Implementing

• Tests should be written using unittest.TestCase, and the test file named list_comprehensions_test.py.
• How to Implement a Concept Exercise in Python
• make-concept-exercise Utility

Help

If you have any questions while implementing the exercise, please post the questions as comments in this issue.

[github-actions]

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