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Re: Trouble with defaults and timeout decorator

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From: pyt...@mrabarnett.plus.com (MRAB)
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Subject: Re: Trouble with defaults and timeout decorator
Date: Sat, 24 Jun 2023 20:03:34 +0100
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by: MRAB - Sat, 24 Jun 2023 19:03 UTC

On 2023-06-24 17:18, Jason Friedman via Python-list wrote:
> I'm writing a database connectivity module to be used by other modules and
> leveraging the jaydebeapi module.
> From what I can tell jaydebeapi contains no built-in timeout capability, so
> then I turned to https://pypi.org/project/timeout-decorator/.
> My goal is to have a default timeout of, say, 10 seconds, which can be
> overridden by the caller.
>
>
> import jaydebeapi
> from timeout_decorator import timeout
>
> class Database:
> database_connection = None
> database_name, user_name, password, host, port = stuff
> timeout = None
>
> def __init__(self, timeout=10):
> self.timeout = timeout
>
> @timeout(self.timeout)
> def get_connection(self):
> if not self.database_connection:
> self.database_connection = jaydebeapi.connect(some_args)
> return self.database_connection
>
>
> The trouble occurs on line 12 with:
> NameError: name 'self' is not defined

The decorator is applied when the class is defined, but 'self' exists
only in 'Database.__init__' and 'Database.get_connection' when they are
called.

Have you tried applying the decorator "manually" in 'Database.__init__'?

def __init__(self, timeout=10):
self.timeout = timeout
self.get_connection = timeout(self.timeout)(self.get_connection)

Old programmers never die, they just branch to a new address.

devel / comp.lang.python / Re: Trouble with defaults and timeout decorator

Subject	Author
Re: Trouble with defaults and timeout decorator	MRAB