Verify if script name provided is a file before running it

[dukecat0]

• I have added an entry to docs/changelog.md

Summary of changes

pipx run: Verify whether the script name provided is a file before running it
Closes #1152

Test plan

Tested by running

nox -s tests-3.12

[chrysle]

Didn't you want to detect whether the file is a valid script?

[dukecat0]

Didn't you want to detect whether the file is a valid script?

I think a file that has no .py extension or shebang can be a valid script as well. (At least the Python interpreter doesn't care about it.) That's why I personally believe that checking whether it is a file is enough.

[gaborbernat]

Test please 👍

[dukecat0]

Not sure if we need a test for this...? I personally think this is a very minor bug and doesn't require a test.

[gaborbernat]

Not sure if we need a test for this...? I personally think this is a very minor bug and doesn't require a test.

I disagree. Every bug fix must have a test.

[gaborbernat]

Tests please.

[dukecat0]

Tests please.

Added