Tag Archives: python

pip installing jupyterlab may give you the following error (somewhere in the error output anyway!):

      4 | #include "zmq.h"
        |          ^~~~~~~
  compilation terminated.

  error: command 'gcc' failed with exit status 1

  Failed with default libzmq, trying again with /usr/local
  {'libraries': &#91;'zmq'], 'include_dirs': &#91;'/usr/local/include'], 'library_dirs': &#91;'/usr/local/lib/amd64', '/usr/local/lib'], 'runtime_library_dirs': &#91;'/usr/local/lib/amd64', '/usr/local/lib'], 'extra_link_args': &#91;'-m64']}

4 | #include "zmq.h"

| ^~~~~~~

compilation terminated.

error: command 'gcc' failed with exit status 1

Failed with default libzmq, trying again with /usr/local

{'libraries': ['zmq'], 'include_dirs': ['/usr/local/include'], 'library_dirs': ['/usr/local/lib/amd64', '/usr/local/lib'], 'runtime_library_dirs': ['/usr/local/lib/amd64', '/usr/local/lib'], 'extra_link_args': ['-m64']}

The simplest solution I’ve found to this is just to install libzmq. We can pull the latest code from github and install it. I usually install things in /opt but as the pip process will look for libzmq in /usr/local, we’ll install it in there this time.

pkg install git libtool 
git clone https://github.com/zeromq/libzmq.git /export/libzmq
cd /export/libzmq
./autogen.sh
./configure --prefix=/usr/local MAKE=gmake
gmake
gmake install
pip install jupyterlab

pkg install git libtool

git clone https://github.com/zeromq/libzmq.git /export/libzmq

cd /export/libzmq

./autogen.sh

./configure --prefix=/usr/local MAKE=gmake

gmake

gmake install

pip install jupyterlab

If you do put it somewhere other than /usr/local you might need to let pkg-config know. E.g.:

export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/opt/libzmq/lib/pkgconfig/

1	export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/opt/libzmq/lib/pkgconfig/

Tested on a SPARC-M7 T7-1 kernel zone running 11.4.24.0.1.75.0

computing, Solaris

Install scipy on Solaris

July 17, 2020 albertw Leave a comment

When trying to install scipy via pip on Solaris you may encounter this error:

numpy.distutils.system_info.NotFoundError: No lapack/blas resources found.

1	numpy.distutils.system_info.NotFoundError: No lapack/blas resources found.

There’s a simple way to resolve this but it’s not immediately obvious. BLAS (Basic Linear Algebra Subprograms) and LAPACK (Linear Algebra Something Something…?) are actually provided by the Solaris math and perf libraries, so installing those and setting a couple of environment variables will get scipy and numpy up and running for us on Solaris.


pkg install sunperf system/library/math virtualenv gcc system/header 

virtualenv-3.7 /export/venv
. /export/venv/bin/activate

BLAS=/usr/lib/libsunperf.so; export BLAS
LAPACK=/usr/lib/libsunmath.so ; export LAPACK

pip install numpy scipy

pkg install sunperf system/library/math virtualenv gcc system/header

virtualenv-3.7 /export/venv

. /export/venv/bin/activate

BLAS=/usr/lib/libsunperf.so; export BLAS

LAPACK=/usr/lib/libsunmath.so ; export LAPACK

pip install numpy scipy

Python 3.7 is in more SRU’s. It’s best practice to use virtualenv to create a virtual environment to work on rather than installing into the system site-packages. I’ve seen a few users make a mess of the packaging system by updating the system python libraries with pip so please just don’t do it 🙂

Tested on a SPARC-M7 T7-1 kernel zone running 11.4.24.0.1.75.0

computing

Django Q function

April 3, 2020 albertw Leave a comment

When querying objects in django the simplest way is to use the filter() query.

If we have a set of systems for example and we want to filter out those that have a SPARC architecture we could do:

>>>  System.objects.filter(architecture="sparc")

1	>>> System.objects.filter(architecture="sparc")

And if we wanted to narrow that down to only sparc machines that use NIS for name resolution we could do:

System.objects.filter(architecture="sparc").filter(name_resolution="NIS")

1	System.objects.filter(architecture="sparc").filter(name_resolution="NIS")

But that is narrowing down the selection. It’s an AND. What were asking for is systems that are a SPARC _AND_ use NIS. And although we can use exclude() to reject some results it’s still and AND operation. What about an OR query?

What if we wanted to select systems that had either a T5 or a T7 processor? Then we need Q queries.

Q queries take the same form of argument as filter() & exclude() etc. but can be combined using OR operators. Here’s the Q query for our model that looks at the cpu_implementation for T5 or T7:

Q(sysconfig__icontains="T7") | Q(sysconfig__icontains="t5")

1	Q(sysconfig__icontains="T7") \| Q(sysconfig__icontains="t5")

To build our query we just use this Q expression in a filter:

from django.db.models import Q
System.objects.filter(Q(sysconfig__icontains="T7")|Q(sysconfig__icontains="t5"))

1 2	from django.db.models import Q System.objects.filter(Q(sysconfig__icontains="T7")\|Q(sysconfig__icontains="t5"))

computing

Python: Creating a singleton (to control an Arduino)

March 27, 2019 albertw Leave a comment

A while ago I was writing a tool in python to communicate with a sensor on an Arduino. The idea was to have a class for the Arduino that would hold the connection and handle the reading and writing to the serial port. However that way I needed to have the object maintain the connection and the open COM port (this was on windows), but this meant that I could not have multiple objects. Why? Because you can only have one connection to a COM port. The solution – use a Singleton design pattern.

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computing, Solaris

Python : generating unittests on the fly

October 23, 2011 albertw Leave a comment

When creating python unit tests you need to create a method in a unittest class. The problem however is when you don’t know until the code is running what these tests will be. In my particular case I need to run a series of tests against a number of Solaris packages. But I won’t know what the packages will be in advance. Continue reading Python : generating unittests on the fly →

computing, Solaris

Python: Searching for a string within a list – List comprehension

October 20, 2011 albertw 4 Comments

The simple way to search for a string in a list is just to use ‘if string in list’. eg:


>>> list = ['a cat', 'a dog', 'a yacht']
>>> string = 'a cat' 
>>>if string in list: 
...     print 'found a cat!' 
... found a cat!

>>> list = ['a cat', 'a dog', 'a yacht']

>>> string = 'a cat'

>>>if string in list:

... print 'found a cat!'

... found a cat!

Continue reading →

Cademuir

Tag Archives: python

Installing Jupyter Notebooks on Solaris

Install scipy on Solaris

Django Q function

Python: Creating a singleton (to control an Arduino)

Python : generating unittests on the fly

Python: Searching for a string within a list – List comprehension

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