Groups > comp.lang.python > #112084

Re: Float

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From	Dennis Lee Bieber <wlfraed@ix.netcom.com>
Newsgroups	comp.lang.python
Subject	Re: Float
Date	Sat, 30 Jul 2016 12:03:02 -0400
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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/

Thread

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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