New submission from Steven D'Aprano <steve+pyt...@pearwood.info>:

A frequent newbie mistake is to call shell commands from inside the interactive 
interpreter. Most common is to call Python itself.

Here is an example where a Python instructor was allegedly unable to diagnose 
the issue for their students:

https://windowsquestions.com/2021/10/09/syntaxerror-invalid-syntax-perhaps-you-forgot-a-comma/


I think it would be a nice feature if the compiler recognised obvious cases of 
"user tried to call Python from the Python prompt", and suggested a fix. If the 
statement matches the regex r"python\s+" the error message might say "it looks 
like you are trying to run a shell command at the Python prompt" rather than 
suggest a missing comma.

----------
messages: 405764
nosy: steven.daprano
priority: normal
severity: normal
status: open
title: Improve error message when python shell command is entered at the REPL 
prompt
type: enhancement
versions: Python 3.11

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45721>
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