Bugs item #1385055, was opened at 2005-12-19 02:15
Message generated for change (Settings changed) made by nnorwitz
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Category: Python Interpreter Core
Group: Python 2.4
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Harri Pasanen (harripasanen)
Assigned to: Nobody/Anonymous (nobody)
Summary: execfile anomaly with "from __future__ import division"
Initial Comment:
If I have a file init.py with two lines:
from __future__ import division
print 3/4
and I do
[EMAIL PROTECTED] tests]$ python
Python 2.4 (#1, Feb 16 2005, 01:23:25)
[GCC 3.4.3 (Mandrakelinux 10.0 3.4.3-2mdk)] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
>>> execfile('init.py')
0.75
>>> 3/4
0
I would have expected the latter to return 0.75 as
well.
Due to this it seems impossible to provide init code
that would initialize the interactive prompt to
future division behaviour.
The same applies to exec statement.
I'm not sure if this is bug, or an unfortunate
feature. The documention is not very clear on this
issue.
-Harri
----------------------------------------------------------------------
>Comment By: Neal Norwitz (nnorwitz)
Date: 2005-12-20 21:53
Message:
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Closing per your request. I don't see any particularly good
place in the doc to add a comment. I agree a comment about
-Qnew wouldn't hurt.
----------------------------------------------------------------------
Comment By: Harri Pasanen (harripasanen)
Date: 2005-12-19 02:42
Message:
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Looks like this is a duplicate of
[ 567568 ] future division broken w/ PYTHONSTARTUP
http://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=567568
As I suspected, it is an unfortunate feature. Tim's
explication provides the missing documentation. And I
assume the exec statement provides its own anonymous
module.
Btw. where is the -Qnew documented? from __future__
division docs should carry a pointer to it.
Here is another thread on the subject in the ipython
mailing list:
http://scipy.net/pipermail/ipython-user/2005-December/001183.html
This can be closed.
-Harri
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