[issue45721] Improve error message when python shell command is entered at the REPL prompt

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

+1 for adding r"pip\s" as a special case as well. A few months ago, I was trying to (remotely) help a beginner friend debug why his attempt to install a library wasn't working. It took me ages before I realised he was entering it into the interactive REPL rather than a terminal window.

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nosy: +AlexWaygood

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45721>
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