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On 10 February 2013 22:14, Rex Macey <> wrote:
> I should have added that the setup gives an error window "Cannot install" "Python version 3.3 required, which was not found in the registry."

Yes, you should have added this information. Are you sure that Python
3.3 is installed? Have you tried running it? e.g. when I run "python"
in my terminal I get:

oscar:~$ python
Python 2.7.3 (default, Sep 26 2012, 21:51:14)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

>From within Python I can also query the version:
>>> import sys
>>> sys.version
'2.7.3 (default, Sep 26 2012, 21:51:14) \n[GCC 4.7.2]'

Can you get similar output to confirm that Python 3.3 is installed?


Oscar

On Sun, Feb 10, 2013 at 5:14 PM, Rex Macey <> wrote:
> I should have added that the setup gives an error window "Cannot install" "Python version 3.3 required, which was not found in the registry."

I'm guessing that you installed a 64-bit python and are using a 32-bit numpy.

On Sun, 10 Feb 2013 21:22:24 -0500, David Robinow <>
declaimed the following in gmane.comp.python.general:

> On Sun, Feb 10, 2013 at 5:14 PM, Rex Macey <> wrote:
> > I should have added that the setup gives an error window "Cannot install" "Python version 3.3 required, which was not found in the registry."
>
> I'm guessing that you installed a 64-bit python and are using a 32-bit numpy.

Or they somehow found/built/installed a version of Python that did
not add itself to the Windows registry at all.
--
Wulfraed Dennis Lee Bieber AF6VN
HTTP://wlfraed.home.netcom.com/

I am sure I have python installed. I have been running it. in command line the window title is c:\python33\python.exe. The first line begins Python 3..3.0. Later in the line is the string "64 bit <AMD64>] on Win32".

Thus it appears I am trying to run a 32bit numpy with a 64bit python. (Seems like a big ole 64 bit python should be able to swallow a little 32 bittynumpy). Is there a 64bit numpy? If not why not? Can someone get on this? Seriously, I'm under the impression that I need the 64 bit python because I have a 64 bit OS.

On 2/13/2013 9:38 PM, Rex Macey wrote:
> I am sure I have python installed. I have been running it. in command
> line the window title is c:\python33\python.exe. The first line
> begins Python 3.3.0. Later in the line is the string "64 bit <AMD64>]
> on Win32".
>
> Thus it appears I am trying to run a 32bit numpy with a 64bit python.
> (Seems like a big ole 64 bit python should be able to swallow a
> little 32 bitty numpy). Is there a 64bit numpy? If not why not?

Ask the numpy people. I am surprised since a reason to be using 64
rather than 32 bit python is to have objects larger than 2 gigabytes and
memory larger than 4 gigabytes. Numerical/scientific programming is
relatively likely to need such.

> someone get on this? Seriously, I'm under the impression that I need
> the 64 bit python because I have a 64 bit OS.

If you look on your C: drive, you should have both 'Program Files' and
'Program Files (x86)' directories. The latter is for 32 bit programs.

--
Terry Jan Reedy

On 02/13/2013 09:38 PM, Rex Macey wrote:
> I am sure I have python installed. I have been running it. in command line the window title is c:\python33\python.exe. The first line begins Python 3.3.0. Later in the line is the string "64 bit <AMD64>] on Win32".
>
> Thus it appears I am trying to run a 32bit numpy with a 64bit python. (Seems like a big ole 64 bit python should be able to swallow a little 32 bitty numpy). Is there a 64bit numpy? If not why not? Can someone get on this? Seriously, I'm under the impression that I need the 64 bit python because I have a 64 bit OS.
>

I can't answer the Numpy aspects, but I can tell you about 32bit versus
64bit.

A 32 bit OS can only handle 32 bit applications. It's conceivable to
build a 32bit OS that will load and run 64bit apps, but it's probably
impractical, and I don't know of anybody who has tried.

A 64bit OS can and does load both 32bit apps and 64bit apps. But once
it has loaded the app, the entire process has to be of the same
"bittedness". For Windows, that means any DLL's loaded from a 64bit
process have to be 64bit, and any DLL's loaded from a 32bit process must
be 32bit.

A python library may consist entirely of Python code, in which case it
would work for either 32bit or 64bit Python installation. But if the
library includes DLL's (which Numpy certainly would) then there have to
be separate versions of those DLL's.

Now, that library installation package may decide to include both sets
of DLL's, and just install the appropriate ones at installation time.
But that choice is entirely up to the library author.

--
DaveA

On 14 February 2013 05:29, Terry Reedy <> wrote:
> On 2/13/2013 9:38 PM, Rex Macey wrote:
>>
>> I am sure I have python installed. I have been running it. in command
>> line the window title is c:\python33\python.exe. The first line
>> begins Python 3.3.0. Later in the line is the string "64 bit <AMD64>]
>> on Win32".

I don't know why you feel the need to paraphrase this information
rather than simply paste the interpreter message into the email. The
latter would be more useful for others trying to help understand your
problem.

>> Thus it appears I am trying to run a 32bit numpy with a 64bit python.
>> (Seems like a big ole 64 bit python should be able to swallow a
>> little 32 bitty numpy). Is there a 64bit numpy? If not why not?

Because numpy/scipy make extensive use of Python's underlying binary
interfaces. These are incompatible between 32 and 64 bit Python.

> Ask the numpy people. I am surprised since a reason to be using 64 rather
> than 32 bit python is to have objects larger than 2 gigabytes and memory
> larger than 4 gigabytes. Numerical/scientific programming is relatively
> likely to need such.

Yes but most people who are doing that sort of thing would just
compile their own numpy/scipy and probably wouldn't be using Windows
for the their main computations anyway. Numpy does work on 64 bit
Python but official binaries are not distributed via the sourceforge
page. Unofficial binaries are available here:
http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy

>> someone get on this? Seriously, I'm under the impression that I need
>> the 64 bit python because I have a 64 bit OS.

I don't know about Windows 8 but I've used 32 bit Python on 64 bit XP
no problem. My impression was that 64 bit Windows (unlike OSX and most
Linux distros) ships with 32 bit duplicates of all its libraries so
that it can run 32 bit applications without modification. My Windows
usage significantly predates Windows 8, though so this may have
changed some time ago.


Oscar