How can I use __future__ division in the IDLE startup file

Question

In Python 2.7, how can I make the IDLE app use \__future__ division without typing from \__future__ import division manually every time I start IDLE?

If I put from \__future__ import division at the top of my .idlestartup file it is ignored, even though the other things in .idlestartup get executed. For example:

~> cat >.idlestartup
from __future__ import division
print("Executing .idlestartup")
~> idle -s

Here's what my IDLE window looks like after I try dividing:

Python 2.7.8 |Anaconda 2.1.0 (x86_64)| (default, Aug 21 2014, 15:21:46) 
[GCC 4.2.1 (Apple Inc. build 5577)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> 
Executing .idlestartup
>>> 2/3
0
>>>

I am using Mac OS X 10.9.5 Mavericks (also had the same problem on earlier versions of OS X). Note that the command line version above was included to make it easier to show what I'm talking about, but the version I'm more interested in is running the IDLE app from the GUI.

The solution suggested by Ashwini Chaudhary below worked for running the Anaconda version from the command line but not for running the IDLE app.

I was finally able to get future division working automatically in the IDLE app by adding "sys.argv.insert(1, '-Qnew')" to /Applications/IDLE.app/Contents/MacOS/IDLE. Both that and Ashwini Chaudhary's solution below seem brittle. I wonder if there is a cleaner way.

Answer 1

Adding the __future__ statement at the top of /usr/lib/python2.7/idlelib/PyShell.py did the job for me.

I am on Ubuntu, the path may vary for other OS:

>>> import idlelib
>>> idlelib.PyShell.__file__
'/usr/lib/python2.7/idlelib/PyShell.py'