How do I make a constant global variable in Python Please

[Remco Gerlich]

Jeff Massung wrote in comp.lang.python:
> Along the same lines... is there a way to say a variable must be declared
> before use? I know Perl has something like this. I just want to avoid
> something like this following:

No, simply because there is no way to declare a variable.

> ate = 1
> while ate:
>     # do something here
>     ...
>     are = 1
> 
> This will loop infinitely just because of a typo (that if the above were
> added I would get an error saying that "are" wasn't declared).

It's happened a few times to me, but you notice that sort of error almost
immediately, in my experience.

Note that it would loop too if it said "ate = 1" as you seemed to intend -
you need to test to find errors anyway...

Also, this problem only occurs with assignment. If you try to use a new
variable in an expression, an exception will be raised, because the variable
can't be found.

ate = 1
x = are

gives an exception.


Python has no declarations, and nothing is a 'constant' as in other languages.

-- 
Remco Gerlich,  scarblac at pino.selwerd.nl

   This is no way to be
     Man ought to be free      -- Ted Bundy
       That man should be me