Re: variable vs. object

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From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: variable vs. object
Date	Mon, 30 Nov 2015 19:19:18 +1100
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On Mon, Nov 30, 2015 at 1:06 PM, fl <rxjwg98@gmail.com> wrote:
> For example,
>
> a=10
>
> 'a' is an integer. Is it an object too?

Other people have explained the difference between the name "a" and
the object it's bound to... but to the extent that "a" is an integer,
yes it most definitely is an object. To be specific, the integer 10 is
an object, as you can see thus:

>>> a = 10
>>> a.to_bytes(4, "big")
b'\x00\x00\x00\n'
>>> (a*12+8).to_bytes(4,"big")
b'\x00\x00\x00\x80'

Every expression [1] in Python has a value which is some sort of
object, so you can do method calls on anything at all. Sometimes this
looks a bit odd, but it does work:

>>> 7.25.as_integer_ratio()
(29, 4)

The floating-point number 7.25 is represented in Python as a float
object, and float objects have methods, same as all objects do. In
this case, I've asked Python to tell me what this number would be as a
fraction (ratio) of integers - 29/4 is equal to 7.25, so that's what
it returns.

So yes! It is an object. Everything is an object!

ChrisA

[1] To silence the nitpickers: An expression could raise an exception,
or not terminate at all. As Grandpa said in The Princess Bride, you're
very clever, now shut up.

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Thread

variable vs. object fl <rxjwg98@gmail.com> - 2015-11-29 18:06 -0800
  Re: variable vs. object Joel Goldstick <joel.goldstick@gmail.com> - 2015-11-29 21:16 -0500
  Re: variable vs. object André Roberge <andre.roberge@gmail.com> - 2015-11-29 18:24 -0800
    Re: variable vs. object Ben Finney <ben+python@benfinney.id.au> - 2015-11-30 13:45 +1100
  Re: variable vs. object Ben Finney <ben+python@benfinney.id.au> - 2015-11-30 13:41 +1100
  Re: variable vs. object Marko Rauhamaa <marko@pacujo.net> - 2015-11-30 07:28 +0200
  Re: variable vs. object Nagy László Zsolt <gandalf@shopzeus.com> - 2015-11-30 09:09 +0100
  Re: variable vs. object Chris Angelico <rosuav@gmail.com> - 2015-11-30 19:19 +1100

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