[issue44711] Optimize type check in pipes.py

[Anton G.]

New submission from Anton G. <anton.gruebel at googlemail.com>:

When I did some work on typeshed I found some weird syntax in pipes.py.

if type(cmd) is not type(''):

which can easily be changed to

if not isinstance(cmd, str):

There are two occurrences and I will directly create the PR :)

----------
components: Library (Lib)
messages: 397995
nosy: anton.gruebel
priority: normal
severity: normal
status: open
title: Optimize type check in pipes.py
type: performance

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44711>
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