On 2018-06-18 13:18, Chris Angelico wrote: > 1) Parse the code, keeping all the non-essential parts as well as the > essential parts. > 2) Find the comments, or find the annotations > 3) If comments, figure out if they're the ones you want to remove. > 4) Reconstruct the file without the bits you want to remember. > > Step 3 is removed if you're using syntactic annotations. Otherwise, > they're identical.
It's likely that Python comments are much easier to remove than arbitrary bits of Python syntax--you need to know the answer to "am I in a string literal?", which is a lexical analysis problem you could hack together a solution for over the course of about one coffee, as opposed to "where exactly am I in the Python parse tree?", which is... harder. The information you need to keep track of and later reconstruct is substantially simpler, too. I don't think "they're hard to mechanically remove" is a particularly good argument against type hints, but considered on its own it probably is true.
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