Trouble with defaults and timeout decorator

[MRAB]

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)