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devel / comp.lang.python / Re: Match statement with literal strings

SubjectAuthor
* Match statement with literal stringsJason Friedman
`* Re: Match statement with literal stringsGreg Ewing
 `- Re: Match statement with literal stringsJason Friedman

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Match statement with literal strings

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From: jsf80...@gmail.com (Jason Friedman)
Newsgroups: comp.lang.python
Subject: Match statement with literal strings
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 by: Jason Friedman - Wed, 7 Jun 2023 22:18 UTC

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

Re: Match statement with literal strings

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From: greg.ew...@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: Match statement with literal strings
Date: Thu, 8 Jun 2023 11:58:51 +1200
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 by: Greg Ewing - Wed, 7 Jun 2023 23:58 UTC

On 8/06/23 10:18 am, Jason Friedman wrote:
> SyntaxError: name capture 'RANGE' makes remaining patterns unreachable

The bytecode compiler doesn't know that you intend RANGE
to be a constant -- it thinks it's a variable to bind a
value to.

To make this work you need to find a way to refer to the
value that isn't just a bare name. One way would be to
define your constants using an enum:

class Options(Enum):
RANGE = "RANGE"
MANDATORY = "MANDATORY"

match stuff:
case Options.RANGE:
...
case Options.MANDATORY:
...

--
Greg

Re: Match statement with literal strings

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From: jsf80...@gmail.com (Jason Friedman)
Newsgroups: comp.lang.python
Subject: Re: Match statement with literal strings
Date: Wed, 7 Jun 2023 18:44:53 -0600
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<kecjtuFnbj5U1@mid.individual.net>
 by: Jason Friedman - Thu, 8 Jun 2023 00:44 UTC

>
> The bytecode compiler doesn't know that you intend RANGE
> to be a constant -- it thinks it's a variable to bind a
> value to.
>
> To make this work you need to find a way to refer to the
> value that isn't just a bare name. One way would be to
> define your constants using an enum:
>
> class Options(Enum):
> RANGE = "RANGE"
> MANDATORY = "MANDATORY"
>
> match stuff:
> case Options.RANGE:
> ...
> case Options.MANDATORY:
> ...
>

Got it, thank you.

On Wed, Jun 7, 2023 at 6:01 PM Greg Ewing via Python-list <
python-list@python.org> wrote:

> On 8/06/23 10:18 am, Jason Friedman wrote:
> > SyntaxError: name capture 'RANGE' makes remaining patterns unreachable
>
> The bytecode compiler doesn't know that you intend RANGE
> to be a constant -- it thinks it's a variable to bind a
> value to.
>
> To make this work you need to find a way to refer to the
> value that isn't just a bare name. One way would be to
> define your constants using an enum:
>
> class Options(Enum):
> RANGE = "RANGE"
> MANDATORY = "MANDATORY"
>
> match stuff:
> case Options.RANGE:
> ...
> case Options.MANDATORY:
> ...
>
> --
> Greg
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>

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