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Groups > comp.lang.python > #112084
| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Float |
| Date | 2016-07-30 12:03 -0400 |
| Organization | IISS Elusive Unicorn |
| Message-ID | <mailman.54.1469895489.6033.python-list@python.org> (permalink) |
| References | (2 earlier) <367666cb-224f-4b16-88bb-cd1ada13a13b@googlegroups.com> <579c82a6$0$1619$c3e8da3$5496439d@news.astraweb.com> <e5d77dc3-2fe4-4352-9582-8a259f3c4f9d@googlegroups.com> <CAPTjJmri1uAicp_VnZ+b3+goWASGkW4yaAKJdLqcbs2N72Sz_Q@mail.gmail.com> <apjppbtocn2vs6v581clq8470on5b14sce@4ax.com> |
On Sat, 30 Jul 2016 21:51:29 +1000, Chris Angelico <rosuav@gmail.com>
declaimed the following:
>In a computing context, data types are incredibly significant. So yes,
>3.0 *is* a floating-point number. It's equal to the integer 3, because
>they represent the same number, but it's not identical to it. You can
>convert from one to the other with the built-ins int and float:
>
>>>> 3.0 == 3
>True
>>>> int(3.0)
>3
>>>> float(3)
>3.0
And in a rather convoluted route, one can get to the underlying
representation...
>>> import struct
>>> f = struct.pack(">f", 3.0)
>>> i = struct.pack(">i", 3)
>>> fi = struct.unpack(">i", f)
>>> ii = struct.unpack(">i", i) #really a waste of time
>>> "0x%8.8X 0x%8.8X" % (fi[0], ii[0])
'0x40400000 0x00000003'
>>>
--
Wulfraed Dennis Lee Bieber AF6VN
wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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Float Cai Gengyang <gengyangcai@gmail.com> - 2016-07-29 02:44 -0700
Re: Float Lutz Horn <lutz.horn@posteo.de> - 2016-07-29 11:56 +0200
Re: Float Ben Finney <ben+python@benfinney.id.au> - 2016-07-29 20:25 +1000
Re: Float Steven D'Aprano <steve@pearwood.info> - 2016-07-30 00:26 +1000
Re: Float Cai Gengyang <gengyangcai@gmail.com> - 2016-07-30 03:21 -0700
Re: Float Steven D'Aprano <steve@pearwood.info> - 2016-07-30 20:34 +1000
Re: Float Cai Gengyang <gengyangcai@gmail.com> - 2016-07-30 04:44 -0700
Re: Float Chris Angelico <rosuav@gmail.com> - 2016-07-30 21:51 +1000
Re: Float Rustom Mody <rustompmody@gmail.com> - 2016-07-30 20:20 -0700
Re: Float Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-08-04 00:28 -0700
Re: Float Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-07-30 12:03 -0400
Re: Float eryk sun <eryksun@gmail.com> - 2016-07-30 18:19 +0000
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