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Re:Python for Non-Programmers by catalogia on Friday April 03, 2020 @02:03PM (#22772275)
> Filename extensions are usually hidden in macOS, but if you find them useful, you can show them.

https://support.apple.com/guide/mac-help/show-or-hide-filena...

(This matches my experience. Perhaps you simply forget changing this setting.)

Re:Python for Non-Programmers by mixmastamyk on Friday April 03, 2020 @02:11PM (#22772345)
Yes, I don't use it much, and must have changed it the first day.