[Python-Dev] Re: PEP 622 version 2 (Structural Pattern Matching)

2020年7月11日 10:42:14 -0700

Glenn Linderman wrote:
> On 7/10/2020 3:15 AM, Gustavo Carneiro wrote:
...
> > Therefore, I posit that the style of try...except indentation only 
> > works where the number of cases is small.
> > But for the case of pattern matching, I expect the number of cases to 
> > be matched to be a lot higher than exception handling cases. Having 
> > cases to be matched be indented is, IMHO, a nice visual cue to help 
> > the reader understand where the pattern matching block ends.
> Actually, the current if elseif elseif elseif else, used now because 
> Python has no switch/match/case, has exactly the same issue as you 
> describe as a problem with try if there were more cases... and if often 
> has more cases, just like match will.
True
> So your concern seems nebulous. You may have wished for extra 
> indentation.... but it is simple to get more indentation: use 8 spaces 
> instead of 4. So if you really wanted it, you could have had it.
Not so true. 
 if a: ...
 elif b: ...
 elif c: ...
 else:
is not valid. In practice, I interpret wanting to indent at a place that 
doesn't require it as a code smell suggesting I should try to break out a 
helper function, but ... it does happen.
-jJ
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