Underscores in Python numbers

Dave Hansen iddw at hotmail.com
Sat Nov 19 01:03:46 CET 2005


Sorry for the delayed response.  I somehow missed this earlier.

On Tue, 8 Nov 2005 15:39:09 +0000 (UTC) in comp.lang.python,
roy at panix.com (Roy Smith) wrote:

>Dave Hansen  <iddw at hotmail.com> wrote:
>> Of course, I write _far_ more code in C than Python.  But I've seen
>> enough bugs of the sort where someone wrote 1200000 when they meant

Digression: 1 was enough.

>> 12000000, that I see great value in being able to specify 12_000_000.
>
>I'll admit that being able to write 12_000_000 would be convenient.
>On the other hand, writing 12 * 1000 * 1000 is almost as clear.  In C,

Perhaps, but it's pretty obvious that something's wrong when you have
to resort to ugly tricks like this to make the value of a simple
integer constant "clear."

And think about 64 (or longer) -bit unsigned long long hexadecimal
values.  How much nicer is 0xFFF0_FF0F_F0FF_0FFF_ULL than
0xFFF0FF0FF0FF0FFFULL?  I guess we could do something like
((((0xFFF0ULL<<16)|0xFF0FULL)<<16)|0xF0FFULL)<<16)|0x0FFFULL), but I'm
not sure it's any better.

Regards,
                                        -=Dave

-- 
Change is inevitable, progress is not.



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