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Re: Recover handle to shadowed builtin?

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In article <mailman.5194.1389210743.18130.python-list@python.org>,
Roy Smith  <roy@panix.com> wrote:
>I'm working with ipython's pylab mode, which replaces the builtin sum() =
>with the one from numpy:
>[...]
>Is there any way to recover a reference to the builtin sum()?

Sigh.  I figured this out myself.  What you want is __builtins__.sum ...

BUT, not only does pylab overwrite sum(), it overwrites __builtins__
as well!  Instead of a module, it's now a dict.  You can still get at
the builtin sum, but you need to do __builtins__["sum"]

========================================================   
$ ipython
Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
Type "copyright", "credits" or "license" for more information.

IPython 0.12.1 -- An enhanced Interactive Python.
[...]
In [1]: type(__builtins__)
Out[1]: module
========================================================   
$ ipython --pylab
Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
Type "copyright", "credits" or "license" for more information.

IPython 0.12.1 -- An enhanced Interactive Python.
[...]
In [1]: type(__builtins__)
Out[1]: dict
========================================================   

I am slowly coming to the conclusion that the best way to deal with
pylab is to not use it.  Overwriting sum() with a different sum() I
can accept, as a useful shortcut.  Overwriting __builtins__ seems like
wanton vandalism of the namespace.

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Thread

Recover handle to shadowed builtin? Roy Smith <roy@panix.com> - 2014-01-08 14:52 -0500
  Re: Recover handle to shadowed builtin? roy@panix.com (Roy Smith) - 2014-01-08 15:15 -0500
    Re: Recover handle to shadowed builtin? Chris Angelico <rosuav@gmail.com> - 2014-01-09 09:22 +1100

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