[New-bugs-announce] [issue47202] Feature request: Throw an error when making impossible evaluation against an empty list

[Luminair]

New submission from Luminair <luminair at gmail.com>:

Below are four examples of impossible code that operates on nothing. The latter two continue silently, throwing no errors. I saw a bug sneak by because of this. I wonder if it is within the scope of Python's design to throw Exceptions in these situations? 

x = 

for x in : print("This code is never reached")

while(None): print("This code is never reached")

emptylist = []
for x in emptylist:
    if emptylist[x] == "This code is never reached":
        print("This code is never reached")
    else: print("This code is never reached")

----------
components: Parser
messages: 416559
nosy: Luminair, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: Feature request: Throw an error when making impossible evaluation against an empty list
type: enhancement
versions: Python 3.11

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47202>
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