into the Python core.
Thanks for your comments. I think they will help the discussion
currently taking place.
-Travis Oliphant
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Martin v. Löwis wrote:
Travis Oliphant wrote:
I am a co-author of the current PEP regarding inclusion of the
multidimensional array object into the core. However, that PEP is
sorely outdated.
[...]
1) What specifically about Numeric prevented it from being acceptable
as an addition
David Ascher wrote:
I've not followed the num* discussion in quite a while, but my
impression back then was that there wasn't one such community.
Instead, the technical differences in the approaches required in
specific fields, regarding things like the relative importance of
memory profiles,
Martin v. Löwis wrote:
The PEP should list the options, include criteria
for selection, and then propose a choice. People can then discuss
whether the list of options is complete (if not, you need to extend
it), whether the criteria are agreed (they might be not, and there
might be difficult
[Travis]
I appreciate some of what Paul is saying here, but I'm not fully
convinced that this is still true with Python 2.2 and up new-style
c-types. The concerns seem to be over the fact that you have to
re-implement everything in the sub-class because the base-class will
always return one
One question we are pursuing is could the arrayobject get into the
core without a particular ufunc object. Most see this as
sub-optimal, but maybe it is the only way.
Since all the artithmetic operations are in ufunc that would be
suboptimal solution, but indeed still a workable one.
I
.
Thanks,
-Travis Oliphant
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.
If this is acceptable, it is an easy patch.
Thanks,
-Travis Oliphant
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Guido van Rossum wrote:
Would it be possible to change
_PyEval_SliceIndex in ceval.c
so that rather than throwing an error if the indexing object is not an
integer, the code first checks to see if the object has a
tp_as_number-nb_int method and calls it instead.
I don't think this is the
. (Perhaps a PythonMethod descriptor object to
complement the Method Descriptor).
Any hints will be helpful.
-Travis Oliphant
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I'm posting to this list to again generate open discussion on the
problem in current Python that an int is used in both the Python
sequence protocol and the Python buffer protocol.
The problem is that a C-int is typically only 4 bytes long while there
are many applications (mmap for example),
to be reworked into something more
along the lines of the previously-proposed bytes object before a
separate bytecode for pickleable mutable-bytes is accepted, however.
-Travis Oliphant
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Greg Ewing wrote:
Travis Oliphant wrote:
I'm proposing to pickle the buffer object so that it unpickles as a
string.
Wouldn't this mean you're only solving half the problem?
Unpickling a Numeric array this way would still use an
intermediate string.
Well, actually, unpickling in the new numeric
but this could be modified as desired.
The code is available in the Numeric3 CVS tree at the numeric python
sourceforge site.
-Travis Oliphant
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as a .__getitem__ wrapper method.
Why does this wrapper call the sequence getitem instead of the mapping
getitem method?
Is there anyway to get at a mapping-style __getitem__ method from Python?
This looks like a bug to me (which is why I'm posting here...)
Thanks for any help or insight.
-Travis
Guido van Rossum wrote:
On 10/1/05, Travis Oliphant [EMAIL PROTECTED] wrote:
The new ndarray object of scipy core (successor to Numeric Python) is a
C extension type that has a getitem defined in both the as_mapping and
the as_sequence structure.
The as_sequence mapping is just so
[EMAIL PROTECTED] wrote:
Travis More to the point, however, these scalar objects were allocated
Travis using the standard PyObject_New and PyObject_Del functions which
Travis of course use the Python memory manager. One user ported his
Travis (long-running) code to the new scipy
Josiah Carlson wrote:
Robert Kern [EMAIL PROTECTED] wrote:
[1] There *is* an array type for general PyObjects in scipy_core, but
that's not being used in the code that blows up and has nothing to do
with the problem Travis is talking about.
I seemed to have misunderstood the
Jim Jewett wrote:
Do you have the code that caused problems?
Yes. I was able to reproduce his trouble and was trying to debug it.
The things I would check first are
(1) Is he allocating (peak usage) a type (such as integers) that
never gets returned to the free pool, in case you need more
Bingo. Yes, definitely allocating new _types_ (an awful lot of
them...)
--- that's what the array scalars are: new types created in C.
Do you really mean that someArray[1] will create a new type to represent
the second element of someArray? I would guess that you create an
instance of
Martin v. Löwis wrote:
Travis Oliphant wrote:
So, I now believe that his code (plus the array scalar extension
type) was actually exposing a real bug in the memory manager itself.
In theory, the Python memory manager should have been able to re-use
the memory for the array-scalar
Martin v. Löwis wrote:
Travis Oliphant wrote:
As verified by removing usage of the Python PyObject_MALLOC function,
it was the Python memory manager that was performing poorly. Even
though the array-scalar objects were deleted, the memory manager
would not re-use their memory for later
Thank you, Martin and Stephen, for the suggestions and comments.
For your information:
We decided that all NumPy arrays of unicode strings will use UCS4 for
internal representation. When an element of the array is selected, a
unicodescalar (which inherits directly from the unicode builtin
: $Date: 2006/02/09 $
Author: Travis Oliphant oliphant at ee.byu.edu
Status: Draft
Type: Standards Track
Created: 09-Feb-2006
Python-Version: 2.5
Abstract
This PEP proposes adding an sq_index slot in PySequenceMethods and
an __index__ special method so that arbitrary objects can be used
Eric Nieuwland wrote:
Travis Oliphant wrote:
PEP: ###
Title: Allowing any object to be used for slicing
[...]
Rationale
Currently integers and long integers play a special role in slice
notation in that they are the only objects allowed in slice
syntax. In other words, if X
Thomas Wouters wrote:
On Fri, Feb 17, 2006 at 05:29:32PM +0100, Armin Rigo wrote:
Where obj must be either an int or a long or another object that has
the
__index__ special method (but not self).
The anything but not self rule is not consistent with any other
special
Martin v. Löwis wrote:
Just in case you haven't noticed, I just merged
the ssize_t branch (PEP 353).
If you have any corrections to the code to make which
you would consider bug fixes, just go ahead.
If you are uncertain how specific problems should be resolved,
feel free to ask.
If
Thomas Wouters wrote:
On Fri, Feb 17, 2006 at 04:40:08PM -0700, Travis Oliphant wrote:
What is PY_SSIZE_T_MAX supposed to be? The definition in pyport.h
doesn't compile.
Maybe I have the wrong version of code. In my pyport.h (checked out
from svn trunk) I have.
#define PY_SSIZE_T_MAX
Edward C. Jones wrote:
Travis E. Oliphant [EMAIL PROTECTED] wrote:
It is very important for many people to get access to memory with some
description of how that memory should be interpreted as an array.
Several Python packages could benefit if Python had some notion of an
array
If you have Numeric or numpy installed try this:
#import Numeric as N
import numpy as N
a = range(10)
b = N.arange(10)
a.__iadd__(b)
print a
Result:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Contrast the returned output with
import numpy as N
a = range(10)
b =
Steven Bethard wrote:
I know 2.5's not out yet, but since I now have a PEP number, I'm going
to go ahead and post this for discussion. Currently, the target
version is Python 2.6. You can also see the PEP at:
http://www.python.org/dev/peps/pep-0359/
Thanks in advance for the feedback!
-talk between all of us different users of the notion
of what we in the NumPy community call a data-type might be useful.
-Travis Oliphant
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Guido van Rossum wrote:
What do you think (10**10).__index__() should return (when called from
Python)?
I'm with Guido on this point. I think (10**10).__index__() should
return the full long integer when called from within Python.
-Travis
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Martin v. Löwis wrote:
Josiah Carlson schrieb:
One could also toss wxPython, VTK, or any one of the other GUI libraries
into the mix for visualizing those images, of which wxPython just
acquired no-copy display of PIL images, and being able to manipulate
them with numpy (of which some wxPython
Jim Jewett wrote:
Travis E. Oliphant wrote:
Two packages need to share a chunk of memory (the package authors do not
know each other and only have and Python as a common reference). They
both want to describe that the memory they are sharing has some
underlying binary structure.
As a
Greg Ewing wrote:
Travis E. Oliphant wrote:
Greg Ewing wrote:
What exactly does bit mean in that context?
Do you mean big ?
No, you've got a data type there called bit,
which seems to imply a size, in contradiction
to the size-independent nature of the other
types. I'm asking
Martin v. Löwis wrote:
Robert Kern schrieb:
As I unification mechanism, I think it is insufficient. I doubt it
can express all the concepts that ctypes supports.
What do you think is missing that can't be added?
I can factually only report what is missing. Whether it can be added,
I
Armin Rigo wrote:
Hi Travis,
On Fri, Oct 27, 2006 at 02:05:31PM -0600, Travis E. Oliphant wrote:
This PEP proposes adapting the data-type objects from NumPy for
inclusion in standard Python, to provide a consistent and standard
way to discuss the format of binary data.
How
Greg Ewing wrote:
Travis Oliphant wrote:
Part of the problem is that ctypes uses a lot of different Python types
(that's what I mean by multi-object to accomplish it's goal). What
I'm looking for is a single Python type that can be passed around and
explains binary data.
It's
Martin v. Löwis wrote:
Travis Oliphant schrieb:
So, the big difference is that I think data-formats should be
*instances* of a single type.
This is nearly the case for ctypes as well. All layout descriptions
are instances of the type type. Nearly, because they are instances
of subtypes
Nick Coghlan wrote:
Travis E. Oliphant wrote:
However, the existence of an alternative strategy using a single Python
type and multiple instances of that type to describe binary data (which
is the NumPy approach and essentially the array module approach) means
that we can't just a-priori
Martin v. Löwis wrote:
Travis E. Oliphant schrieb:
But, there are distinct disadvantages to this approach compared to what
I'm trying to allow. Martin claims that the ctypes approach is
*basically* equivalent but this is just not true.
I may claim that, but primarily, my goal was to
Thomas Heller wrote:
(I tried to read the whole thread again, but it is too large already.)
There is a (badly named, probably) api to access information
about ctypes types and instances of this type. The functions are
PyObject_stgdict(obj) and PyType_stgdict(type). Both return a
Martin v. Löwis wrote:
Stephan Tolksdorf schrieb:
While Travis' proposal encompasses the data format functionality within
the struct module and overlaps with what ctypes has to offer, it does
not aim to replace ctypes.
This discussion could have been a lot shorter if he had said so.
Paul Moore wrote:
On 10/31/06, Travis Oliphant [EMAIL PROTECTED] wrote:
Martin v. Löwis wrote:
[...] because I still don't quite understand what the PEP
wants to achieve.
Are you saying you still don't understand after having read the extended
buffer protocol PEP, yet?
I can't speak
Martin v. Löwis wrote:
Travis E. Oliphant schrieb:
Several extensions to Python utilize the buffer protocol to share
the location of a data-buffer that is really an N-dimensional
array. However, there is no standard way to exchange the
additional N-dimensional array information
Jim Jewett wrote:
I'm still not sure exactly what is missing from ctypes. To make this
concrete:
I think the only thing missing from ctypes expressiveness as far as I
can tell in terms of what you can do is the byte-order representation.
What is missing is ease-of use for producers and
Martin v. Löwis wrote:
Travis E. Oliphant schrieb:
Or, if it does have uses independent of the buffer extension: what
are those uses?
So that NumPy and ctypes and audio libraries and video libraries and
database libraries and image-file format libraries can communicate about
Fredrik Lundh wrote:
Chris Barker wrote:
While /F suggested we get off the PIL bandwagon
I suggest we drop the obsession with pointers to memory areas that are
supposed to have a specific format; modern data access API:s don't work
that way for good reasons, so I don't see why Python
Martin v. Löwis wrote:
Travis E. Oliphant schrieb:
2) complex-valued types (you might argue that it's just a 2-array of
floats, but you could say the same thing about int as an array of
bytes). The point is how do people interpret the data. Complex-valued
data-types are very common. It is
Fredrik Lundh wrote:
Chris Barker wrote:
While /F suggested we get off the PIL bandwagon
I suggest we drop the obsession with pointers to memory areas that are
supposed to have a specific format; modern data access API:s don't work
that way for good reasons, so I don't see why Python
Alexander Belopolsky wrote:
Travis Oliphant oliphant.travis at ieee.org writes:
b = buffer(array('d', [1,2,3]))
there is not much that I can do with b. For example, if I want to pass it to
numpy, I will have to provide the type and shape information myself:
numpy.ndarray(shape=(3
Paul Moore wrote:
Enough of the abstract. As a concrete example, suppose I have a (byte)
string in my program containing some binary data - an ID3 header, or a
TCP packet, or whatever. It doesn't really matter. Does your proposal
offer anything to me in how I might manipulate that data
Martin v. Löwis wrote:
Travis E. Oliphant schrieb:
2. Should primitive type codes be characters or integers (from an enum) at
C level?
- I prefer integers
3. Should size be expressed in bits or bytes?
- I prefer bits
So, you want an integer enum for the kind and an integer for the
T
IIUC, so far the 'data-object' carries information about the structure
of the data it describes.
Couldn't it go a step further and have also some functionality?
Converting the data into a Python object and back?
Yes, I had considered it to do that. That's why the setfunc and getfunc
Perhaps the most relevant thing to pull from this conversation is back
to what Martin has asked about before: flexible array members. A TCP
packet has no defined length (there isn't even a header field in the
packet for this, so in fairness we can talk about IP packets which
do). There
Martin v. Löwis wrote:
Travis Oliphant schrieb:
r_field = PyDict_GetItemString(dtype,'r');
Actually it should read PyDict_GetItemString(dtype-fields).The
r_field is a tuple (data-type object, offset). The fields attribute is
(currently) a Python dictionary.
Ok
every element of any
object that exposes the buffer protocol.
Thanks for any feedback,
-Travis Oliphant
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Attached is the PEP.
:PEP: XXX
:Title: Revising the buffer protocol
:Version: $Revision: $
:Last-Modified: $Date: $
:Author: Travis Oliphant [EMAIL PROTECTED]
:Status: Draft
:Type: Standards Track
:Content-Type: text/x-rst
:Created: 28-Aug-2006
:Python-Version: 3000
Abstract
This PEP
Greg Ewing wrote:
Travis Oliphant wrote:
The question is should we eliminate the possibility of sharing memory
for objects that store data basically as arrays of arrays (i.e. true
C-style arrays).
Can you clarify what you mean by this? Are you talking
about an array of pointers
Greg Ewing wrote:
Travis Oliphant wrote:
I'm talking about arrays of pointers to other arrays:
i.e. if somebody defined in C
float B[10][20]
then B would B an array of pointers to arrays of floats.
No, it wouldn't, it would be a contiguously stored
2-dimensional array of floats
Carl Banks wrote:
We're done. Return pointer.
Thank you for this detailed example. I will have to parse it in more
depth but I think I can see what you are suggesting.
First, I'm not sure why getbuffer needs to return a view object.
The view object in your case would just be the
Hi Carl and Greg,
Here is my updated PEP which incorporates several parts of the
discussions we have been having.
-Travis
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Lisandro Dalcin wrote:
On 3/26/07, Travis Oliphant [EMAIL PROTECTED] wrote:
Here is my updated PEP which incorporates several parts of the
discussions we have been having.
Travis, it looks really good, below my comments
I hope you don't mind me replying to python-dev.
1- Is it hard
Carl Banks wrote:
Travis E. Oliphant wrote:
I think we are getting closer. What do you think about Greg's idea
of basically making the provider the bufferinfo structure and having
the exporter handle copying memory over for shape and strides if it
wants to be able to change those before
Carl Banks wrote:
Only one concern:
typedef int (*getbufferproc)(PyObject *obj, struct bufferinfo
*view)
I'd like to see it accept a flags argument over what kind of buffer
it's allowed to return. I'd rather not burden the user to check all
the entries in bufferinfo to make sure
Paul Moore wrote:
Hi,
I'll admit right off that I haven't followed all of the extended
buffer protocol discussions - I have no real need for anything much
beyond the existing here's a blob of memory level of functionality.
I have skimmed (briefly, I'll admit!) the pre-PEP, but I've found it
: Revising the buffer protocol
Version: $Revision$
Last-Modified: $Date$
Authors: Travis Oliphant [EMAIL PROTECTED], Carl Banks [EMAIL PROTECTED]
Status: Draft
Type: Standards Track
Content-Type: text/x-rst
Created: 28-Aug-2006
Python-Version: 3000
Abstract
This PEP proposes re-designing
Carl Banks wrote:
Travis Oliphant wrote:
Py_BUF_READONLY
The returned buffer must be readonly and the underlying object
should make
its memory readonly if that is possible.
I don't like the if possible thing. If it makes no guarantees, it
pretty much useless over
Greg Ewing wrote:
From PEP 3118:
A memory-view object is an extended buffer object that
should replace the buffer object in Python 3K.
typedef struct {
PyObject_HEAD
PyObject *base;
struct bufferinfo view;
int itemsize;
int flags;
} PyMemoryViewObject;
If
Neil Hodgson wrote:
Travis Oliphant:
PEP: 3118
...
I'd like to see the PEP include discussion of what to do when an
incompatible request is received while locked. Should there be a
standard Can't do that: my buffer has been got exception?
I'm not sure what standard to make a decision
Lisandro Dalcin wrote:
On 4/9/07, Travis Oliphant [EMAIL PROTECTED] wrote:
Travis, all this is far better and simpler than previous approaches...
Just a few comments
Thanks for your wonderful suggestions. I've incorporated many of them.
1) I assume that 'bufferinfo' structure will be part
Carl Banks wrote:
The thing that bothers me about this whole flags setup is that
different flags can do opposite things.
Some of the flags RESTRICT the kind of buffers that can be
exported (Py_BUF_WRITABLE); other flags EXPAND the kind of buffers that
can be exported (Py_BUF_INDIRECT).
Greg Ewing wrote:
But since the NumPy object has to know about the provider,
it can simply pass the release call on to it if appropriate.
I don't see how this case necessitates making the release call
on a different object.
I'm -1 on involving any other objects or returning object
Carl Banks wrote:
Tr
ITSM that we are using the word view very differently. Consider
this example:
A = zeros((100,100))
B = A.transpose()
You are thinking of NumPy's particular use case. I'm thinking of a
generic use case. So, yes I'm using the word view in two different
contexts.
on the extensions to the struct module until the rest is approved.
Thank you for any and all comments:
-Travis
:PEP: XXX
:Title: Revising the buffer protocol
:Version: $Revision: $
:Last-Modified: $Date: $
:Authors: Travis Oliphant [EMAIL PROTECTED], Carl Banks [EMAIL PROTECTED]
:Status: Draft
:Type
Greg Ewing wrote:
Travis Oliphant wrote:
Carl Banks wrote:
I'd like to see it accept a flags argument over what kind of buffer
it's allowed to return. I'd rather not burden the user to check
all the entries in bufferinfo to make sure it doesn't get something
unexpected.
Yes, I
Greg Ewing wrote:
Carl Banks wrote:
Py_BUF_REQUIRE_READONLY - Raise excpetion if the buffer is writable.
Is there a use case for this?
Yes. The idea is used in NumPy all the time.
Suppose you want to write to an array but only have an algorithm that
works with contiguous data. Then you
Carl Banks wrote:
Ok, I've thought quite a bit about this, and I have an idea that I
think will be ok with you, and I'll be able to drop my main
objection. It's not a big change, either. The key is to explicitly
say whether the flag allows or requires. But I made a few other
changes as
Carl Banks wrote:
Travis Oliphant wrote:
Carl Banks wrote:
Ok, I've thought quite a bit about this, and I have an idea that I
think will be ok with you, and I'll be able to drop my main
objection. It's not a big change, either. The key is to explicitly
say whether the flag allows
Brett Cannon wrote:
Neal, Anthony, Thomas W., and I have a spreadsheet that was started to
keep track of what needs to be done in what needs to be done in 2.6
for Py3K transitioning:
http://spreadsheets.google.com/pub?key=pCKY4oaXnT81FrGo3ShGHGg . I am
opening the spreadsheet up to everyone
Hi all,
I think the latest patch for fixing Issue 708374 (adding offset to mmap)
should be committed to SVN.
I will do it, if nobody opposes the plan. I think it is a very
important addition and greatly increases the capability of the mmap module.
Thanks,
-Travis Oliphant
P.S. Initially
Thomas Heller wrote:
Hi Travis,
The pep contains this sample:
Nested array
::
struct {
int ival;
double data[16*4];
}
i:ival:
(16,4)d:data:
I think it is wrong and must be changed to the following;
Lisandro Dalcin wrote:
On 2/11/08, Travis Oliphant [EMAIL PROTECTED] wrote:
My perception is that you are seeing too much of a connection between
the C-compiler and the PEP description of memory. Perhaps that's not
it, and I'm missing something else.
Travis, all this make me believe
Guido van Rossum wrote:
Moving this to a new subject to keep the discussion of tasks and the
discussion of task tracking tools separate.
On Sun, Mar 16, 2008 at 9:42 AM, Christian Heimes [EMAIL PROTECTED] wrote:
I did a quick brainstorming with me, myself and I. I came up with a list
of
, I've planned to back-port the improvements to the struct
module and the addition of the memoryview object (both in PEP 3118).
If you have questions, we can talk tomorrow.
Best regards,
-Travis Oliphant
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Antoine Pitrou wrote:
Hello,
The Py_buffer struct has two pointers named `shape` and `strides`. Each points
to an array of Py_ssize_t values whose length is equal to the number of
dimensions of the buffer object. Unfortunately, the buffer protocol spec doesn't
explain how allocation of these
Alexander Belopolsky wrote:
On Mon, Dec 8, 2008 at 6:25 PM, Antoine Pitrou [EMAIL PROTECTED] wrote:
..
Alexander's suggestion of going and looking at what the numpy folks have
done in this area is probably a good idea too.
Well, I'm open to others doing this, but I won't do it myself. My
Antoine Pitrou wrote:
Alexander Belopolsky alexander.belopolsky at gmail.com writes:
I did not follow numpy development for the last year or more, so I
won't qualify as the numpy folks, but my understanding is that numpy
does exactly what Nick recommended: the viewed object owns shape and
Antoine Pitrou wrote:
Nick Coghlan ncoghlan at gmail.com writes:
For the slicing problem in particular, memoryview is currently trying to
get away with only one Py_buffer object when it needs TWO.
Why should it need two? Why couldn't the embedded Py_buffer fullfill all the
needs of the
Greg Ewing wrote:
Antoine Pitrou wrote:
Why should it need two? Why couldn't the embedded Py_buffer fullfill
all the
needs of the memoryview object?
Two things here:
1) The memoryview should *not* be holding onto a Py_buffer
in between calls to its getitem and setitem methods. It
Nick Coghlan wrote:
Antoine Pitrou wrote:
In all honesty, I admit I am annoyed by all the problems with the buffer API /
memoryview object, many of which are caused by its utterly bizarre design (and
the fact that the design team went missing in action after imposing such a
bizarre and complex
Antoine Pitrou wrote:
Nick Coghlan ncoghlan at gmail.com writes:
I don't see anything wrong with the PEP 3118 protocol.
Apart from the fact that:
- it uses something (Py_buffer) which is not a PyObject and has totally
different allocation/lifetime semantics (which makes it non-trivial to
Greg Ewing wrote:
Nick Coghlan wrote:
Maintaining a PyDict instance to map from view pointers to shapes
and strides info doesn't strike me as a complex scheme though.
I don't see why a given buffer provider should ever need
more than one set of shape/strides arrays at a time. It
can allocate
spreading, and so we
welcome any and all contributions.
Thank you,
Travis Oliphant
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If it helps anyone in their interest level. My intention would be to make
these changes to NumPy only available on Python 3 as a way to help continue
adoption of Python 3.
-Travis
--
*Travis Oliphant*
*Co-founder and CEO*
@teoliphant
512-222-5440
http://www.continuum.io
if I can't find
someone I will publish the ideas --- but that also takes time and effort
that is in short supply for me right now.
If there is someone willing to fund this work, please let me know as well
-- that could free up more of my time.
Best,
-Travis
--
*Travis Oliphant*
*Co-found
Hey all,
I just wanted to clarify, that I am very excited about a few ideas I have
--- but I don't have time myself to engage in the community process to get
these changes into NumPy. However, those are real processes --- I've
been coaching a few people in those processes for the past several
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