[issue38721] modulefinder should use io.open_code() instead of open()

[Dominic Littlewood]

New submission from Dominic Littlewood <11dlittlewood at gmail.com>:

modulefinder currently will detect modules imported by a script dynamically by running the script, and to do this it has to open the script as a file.

This would also fix what appears to be a bug where modulefinder failed to open files in bytes mode sometimes, causing it to fail for some modules (like functools) if the wrong encoding is used. I say "appears to be", because the structure of the module seems to imply this was intended behaviour, but I can't think why anyone would want this.

This is similar to two other issues I'm posting, but they're in different modules, so different bugs.

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components: Library (Lib)
messages: 356143
nosy: plokmijnuhby
priority: normal
severity: normal
status: open
title: modulefinder should use io.open_code() instead of open()
type: security
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38721>
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