Re: Odd ValueError using float

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Date	Sun, 15 Mar 2015 02:52:07 +1100
Subject	Re: Odd ValueError using float
From	Chris Angelico <rosuav@gmail.com>
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On Sun, Mar 15, 2015 at 2:28 AM, emile <emile@fenx.com> wrote:
> It ran almost to completion before generating the error again --
>
> (Pdb) decval
> '4'
> (Pdb) type(decval)
> <type 'str'>
> (Pdb) len(decval)
> 1
> (Pdb) int(decval)
> *** ValueError: invalid literal for int() with base 10: '41.700000000000003'
>
> So there's still something amiss.

Compare these two lines' outputs:

print("str %d, int %d" % (id(str), id(int)))
print("str %d, int %d" % (id(type("")), id(type(0)))

Any difference in id would indicate that the names have been shadowed
- seems unlikely, but worth checking. And then, just to be absolutely
sure:

type(decval) is type("")

There is another, and very nasty, possibility. If you're working with
a C extension that has a refcount bug in it, all sorts of bizarre
things can happen - crucial type objects getting garbage collected,
objects getting disposed of and others taking their places, all kinds
of weird and wonderful things. Normally that'll eventually cause a
crash, but who knows...

ChrisA

Thread

Odd ValueError using float emile <emile@fenx.com> - 2015-03-13 15:10 -0700
  Re: Odd ValueError using float Paul Rubin <no.email@nospam.invalid> - 2015-03-13 19:33 -0700
    Re: Odd ValueError using float Chris Angelico <rosuav@gmail.com> - 2015-03-14 14:09 +1100
    Re: Odd ValueError using float emile <emile@fenx.com> - 2015-03-14 08:28 -0700
    Re: Odd ValueError using float Chris Angelico <rosuav@gmail.com> - 2015-03-15 02:52 +1100
    Re: Odd ValueError using float Peter Otten <__peter__@web.de> - 2015-03-14 17:08 +0100
    Re: Odd ValueError using float emile <emile@fenx.com> - 2015-03-14 10:08 -0700
    Re: Odd ValueError using float emile <emile@fenx.com> - 2015-03-14 10:17 -0700
    Re: Odd ValueError using float Peter Otten <__peter__@web.de> - 2015-03-14 19:24 +0100
    Re: Odd ValueError using float emile <emile@fenx.com> - 2015-03-14 13:01 -0700
    Re: Odd ValueError using float Peter Otten <__peter__@web.de> - 2015-03-15 15:01 +0100
    Re: Odd ValueError using float emile <emile@fenx.com> - 2015-03-17 13:48 -0700

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