[issue31607] Add listsize in pdb.py

[Stéphane Wirtel]

New submission from Stéphane Wirtel <stephane at wirtel.be>:

I just added a new command for the prompt of Pdb.

(Pdb) listsize
List size: 10
(Pdb) listsize 5
List size: 5
(Pdb) listsize
List size: 5

I will publish a PR

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messages: 303123
nosy: matrixise
priority: normal
severity: normal
status: open
title: Add listsize in pdb.py
type: enhancement
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31607>
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