[issue44711] Optimize type check in pipes.py

[Anton Grübel]

Anton Grübel <anton.gruebel at googlemail.com> added the comment:

I know that :) , it is just weird to do also do the type check on an empty string, which can be replaced with str directly, but as far as I know it is usually better to use isinstance instead of type.

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<https://bugs.python.org/issue44711>
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