help with installation

[MRAB]

On 2020-10-08 17:28, Mats Wichmann wrote:
> On 10/7/20 2:00 AM, rebecca kahn wrote:
>> Good morning.
>> I need to install numpy and matplotlib  for school. But everytime I run the comand i get a error on the metadata fase. Can you offer assistance?
>> Sincerely Rebecca Kahn
>> 
>> Microsoft Windows [Version 10.0.18362.1082]
>> (c) 2019 Microsoft Corporation. Todos os direitos reservados.
>> 
>> C:\Users\Acer>python -m pip install numpy
>> Collecting numpy
>>   Using cached numpy-1.19.2.zip (7.3 MB)
>>   Installing build dependencies ... done
>>   Getting requirements to build wheel ... done
>>     Preparing wheel metadata ... error
>>     ERROR: Command errored out with exit status 1:
> 
> Short answer: be patient.
> 
> The root of this problem is Python 3.9 was *just* released, and some
> (many?) of the packages on PyPI that include version-specific wheels
> have not been updated yet.
> 
> Use a Python 3.8 version if you're in a hurry.  There is a site that has
> unofficial builds of many interesting packages for Windows, but
> personally I'm a little reluctant to point people there, as they're
> unsupported if there are problems.
> 
> You can check the numpy status, as for any package on PyPI by searching
> it and going to the list of downloadable files.  Here:
> 
> https://pypi.org/project/numpy/#files
> 
> Slightly longer description - why you see lots of scary error messages -
> is since pip doesn't find an appropriate wheel, it embarks on the
> process of building one from the source distribution.  This nearly
> always fails for the ordinary Windows user, since the required build
> setup will not be present, complete, or configured.  The errors come
> from this, but that's only because the per-built wheel was not found.
> 
> (this happens every time a new Python version, that is X in 3.X comes out)
> 
It's always worth looking at Christoph Gohlke's site:

https://www.lfd.uci.edu/~gohlke/pythonlibs/

Yes, it does have numpy and matplotlib.