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Duncan Booth duncan at NOSPAMrcp.co.uk
Mon Oct 20 06:09:44 EDT 2003 
David Eppstein <eppstein at ics.uci.edu> wrote in news:eppstein-
D286CF.08171519102003 at news.service.uci.edu:

>> Then, what is the best way to write boolean operations for Python 2.1 so
>> that it will be as 2.3+ ready as possible?
> 
> I've been including the following at the start of some of my code:
> 
> if 'True' not in globals():
>    globals()['True'] = not None
>    globals()['False'] = not True
> 
> My hope is that setting up True and False in this convoluted way will 
> allow it to continue to work in some future version where assignment to 
> builtins is disallowed.

Since True will never be in globals unless you assign it there, you might 
as well just drop the if statement altogether. Also I fail to see what 
benefit you gain from the contorted assignment into the globals dictionary. 
Why not just write:

    True = not None
    False = not True

It has the same effect overall.

If you want to avoid hiding the builtin True and False, then use try..catch 
to detect them.

-- 
Duncan Booth                                             duncan at rcp.co.uk
int month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3"
"\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?
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