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From: Robert Kern <robert.kern@gmail.com>
Subject: Re: line_profiler: what am I doing wrong?
Date: Wed, 11 Feb 2015 15:42:27 +0000
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On 2015-02-11 01:17, Steven D'Aprano wrote:
> Neal Becker wrote:
>
>
>> To quote from https://pypi.python.org/pypi/line_profiler/
>>
>> $ kernprof -l script_to_profile.py
>> kernprof will create an instance of LineProfiler and insert it into the
>> __builtins__ namespace with the name profile.
>
> Ewww!!!! What a Ruby-esque interface, that makes me sad :-(

<shrug> This is not a production library. It's a development tool designed to 
help developers shorten the cycle time for investigating these kinds of issues. 
Well, *a* developer; i.e. me. If it helps anyone else, yahtzee!

> And what if you
> have your own profile global name?

Then you can pull it out from __builtin__ with a different name and use that 
other name.

> And *wrong* too. `__builtins__` is a private CPython implementation detail.
> The way to monkey-patch the built-ins in Python 2 is to inject the object
> into `__builtin__` (no s), or `builtins` in Python 3.

And indeed that is how it is implemented. Referring to that namespace as the 
"`__builtins__` namespace" isn't *wrong*. It may mislead you into thinking I've 
implemented it one particular way, if you are desperate to find a nit to pick.

> Seeing as
> line_profiler is written in C, perhaps the author (Robert Kern) doesn't
> care about supporting Jython or IronPython,  but there may be Python
> implementations (PyPy perhaps?) which can run C code but don't have
> __builtins__.

Indeed, I do not care about any of them. PyPy does not implement CPython's 
tracing API:

https://bitbucket.org/pypy/pypy/src/2b2163d65ee437646194a1ceb2a3153db24c5f7e/pypy/module/cpyext/stubs.py?at=default#cl-1286

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco