It’s like using a linter: you do it because it’s the right thing to do and doing it without the tool confers no benefit and is prone to error.
That _is_ the refactoring tool in my IDE (emacs). i demonstrated replacing _all_of them at once, not replacing them each by hand.
> ... because it’s the right thing to do and doing it without the tool confers no benefit and is prone to error.
There was nothing in my post done "without the tool." Shell/find/perl _is_ the tool for C refactoring, and has been for decades.
> i demonstrated replacing _all_of them at once, not replacing them each by hand.
That is my advice for everyone completing their first Python tutorial: learn a typed language next if you aspire to do serious work. It also saves you writing many manual tests that you had to make otherwise, as the compiler makes that superfluous. Plus your IDE becomes a superpower.