Re: Match statement with literal strings

[Chris Angelico via Python-list]

On Thu, 8 Jun 2023 at 08:19, Jason Friedman via Python-list
<python-list@python.org> wrote:
>
> This gives the expected results:
>
> with open(data_file, newline="") as reader:
> csvreader = csv.DictReader(reader)
> for row in csvreader:
> #print(row)
> match row[RULE_TYPE]:
> case "RANGE":
> print("range")
> case "MANDATORY":
> print("mandatory")
> case _:
> print("nothing to do")
>
> This:
>
> RANGE = "RANGE"
> MANDATORY = "MANDATORY"
> with open(data_file, newline="") as reader:
> csvreader = csv.DictReader(reader)
> for row in csvreader:
> #print(row)
> match row[RULE_TYPE]:
> case RANGE:
> print("range")
> case MANDATORY:
> print("mandatory")
> case _:
> print("nothing to do")
>
> Gives (and I don't understand why):
>
> SyntaxError: name capture 'RANGE' makes remaining patterns unreachable

It's being as clear as it can. When you say "case RANGE:", that is not
a literal, that is a name capture. Check the docs and examples for
case statements for more details.

ChrisA
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