[Python-Dev] Switch statement

Wed Jun 21 20:59:03 CEST 2006

Fredrik Lundh wrote:
>> But in most cases the 'constant' is actually an expression involving a
>> global, often even a global in another module. (E.g. sre_compile.py)
>> The compiler will have a hard time proving that this is really a
>> constant, so it won't optimize the code.
>> unless we come up with a way to make it possible to mark an variable as 
> a constant.

such as the primary
 'constant' expr
which simply means that expr will be evaluated at function definition 
time, rather than at runtime. example usage:
 var = expression
 if var == constant sre.FOO:
 ...
 elif var == constant sre.BAR:
 ...
 elif var in constant (sre.FIE, sre.FUM):
 ...
</F>