Refactor cmd module

[dan1994]

BPO	39303
Nosy	@csabella, @dan1994
PRs	bpo-39303: [WIP] Refactor cmd module #17951

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-01-15.12:15:56.568>
created_at = <Date 2020-01-11.09:52:16.948>
labels = ['type-feature', 'library', '3.9']
title = 'Refactor cmd module'
updated_at = <Date 2020-01-15.12:15:56.565>
user = 'https://github.com/dan1994'

bugs.python.org fields:

activity = <Date 2020-01-15.12:15:56.565>
actor = 'cheryl.sabella'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-15.12:15:56.568>
closer = 'cheryl.sabella'
components = ['Library (Lib)']
creation = <Date 2020-01-11.09:52:16.948>
creator = 'Dan Arad'
dependencies = []
files = []
hgrepos = []
issue_num = 39303
keywords = ['patch']
message_count = 2.0
messages = ['359789', '360047']
nosy_count = 2.0
nosy_names = ['cheryl.sabella', 'Dan Arad']
pr_nums = ['17951']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39303'
versions = ['Python 3.9']

[dan1994]

I've stumbled across the cmd module, had some difficulties in reading it, and wanted to help in making it more readable.

I'm new to contributing to open source, and thought this could be a good exercise for me, and that if I could contribute along the way, then that would be a nice extra.

I would be glad if my efforts could be accompanied by someone more experienced.

[csabella]

Dan, thank you for your contribution. Please see the pull request for the motivation behind closing this.