On Wed, Jun 24, 2020 at 7:40 AM Ethan Furman <et...@stoneleaf.us> wrote:
> Okay, I took Paul Moore's advice and went looking in existing code for > some examples, and came across the following: > > if isinstance(v, int): > # v is an offset > elif isinstance(v, str): > # v is a docstring > elif isinstance(v, tuple) and len(v) in (2, 3) and isinstance(v[0], > baseinteger) and isinstance(v[1], (basestring, NoneType)): > # v is an offset, a docstring, and (maybe) a default > elif isinstance(v, tuple) and len(v) in (1, 2) and isinstance(v[0], > (basestring, NoneType)): > # v is a docstring and (maybe) a default > > That seems like it would be a perfect match (hah) for the new syntax, but > I am not confident in my efforts. > > This is what I started with: > > match v: # goal here is to turn v into an (offset, docstring, > default value) > case int: > v = v, None, None > case str: > v = None, v, None > case (str, ): > # how to combine with above case? > v = None, v[0], None > case (int, str): > v += (None, ) > case (int, str, default): > pass > case (str, default): > v = None, v[0], v[1] > > Which got me to here: > > match v: # goal here is to turn v into an (offset, docstring, > default value) > case int(offset): > v = offset, None, None > case str(doc) | (str(doc), ): > v = None, doc, None > case (int(offset), str(doc)): > v = offset, doc, None > case (int(offset), str(doc), default): > # already correct > pass > case (str(doc), default): > v = None, doc, default > > Is this correct? > Yes. Side note: I would much rather read "case str(doc) or (str(doc), )" instead > of a |. > Duly noted, we'll come back to this. -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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