[Improve Concept Exercise] : inventory-management (dicts)

This issue is for improvements & changes needed to the inventory-management concept exercise on the Python track.

Goals

Improve the Inventory-management (dicts) concept exercise by adding the dict.pop() method & creation via dict literal to the tasks the student has to complete. Make other improvement changes as noted below:

• Edit design.md doc to add dict.pop() to the design
• Edit Introduction.md to add dict.pop() usage.
• Edit instructions.md to add new tasks: - creation of dict literals - using dict.pop()
• Add appropriate hint as needed in hints.md for dict.pop() usage
• Edit exemplar.py to include new idiomatic solution for newly added tasks
• Edit dicts_test.py file to add new tests for dict.pop() task.
• Edit dicts.py stub file to add new tasks.
• Edit test file to explicitly list imported functions/methods by name instead of using import *
• Check/edit all markdown files to conform to the Exercism Markdown Specifications

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 | Help
• What are those Weird Task Tags about?
• Building Language Tracks: An Overview
• What are Concepts?
• Concept Exercise Specifications
• Exercism Formatting and Style Guide
• Exercism Markdown Specification

[BethanyG]

@mukeshgurpude – Oh no! I *did miss it! 😱 so sorry. I will take a look right now. Thanks!

[BethanyG]

The draft PR is here: https://github.com/exercism/python/pull/2530