Informatique / Python / Build Python 2.7.x/3.6.x with Mayavi 4.5.1(dev) and PyQt5 on centOS
7
In this section I explain how to install Mayavi 4.5.1 (development version) on Python 2.7.x, 3.5.x or 3.6.x on
CentOS 7.
The steps are the following :
- installing some required packages
- compiling and installing Python
- installing VTK Python wrapper
- installing PyQt version 5 Python package (version 5 not supported by Mayavi 4.5.0)
- installing Mayavi 4.5.0 Python package
- upgrading Mayavi Python package to version 4.5.1 (Enthought development version)
- upgrading pyface and traitsui Python package to version >=5.2.0 (Enthought development
version)
The installation process described here was succesfully tested with Python 2.7.14, 3.5.5 and 3.6.4.
To use Mayavi 4.5.0 python package, the version 4 of PyQt is needed : version 5 is not supported in this
version of Mayavi. To use PyQt version 5 one has to install Mayavi 4.5.1 (development version on march 2018),
pyface (>= 5.2.0) and traitsui (>=5.2.0)
Required packages
On my CentOS 7 computer, I need to install (as root) the following system packages to compile Python
sudo yum install gcc gcc-c++ gcc-gfortran ncurses-devel tk-devel gdbm-devel \
readline-devel sqlite-devel bzip2-devel openssl-devel xz-devel
Python : compilation and installation
I assume the installation directory to be /fcopt. This directory is writable for me, otherwise one has to be root
for install process. The directory ~/compil is used as working directory.
The following compilation/installation commands are given for Python 3.6.4 version. To use another version,
one only has to set PYVER variable. The PYDIR variable contains /fcopt/PYTHON/3.6.4 which is the
installation directory and the CDIR variable contains ~/compil which is the compilation directory.
PYVER=3.6.4CDIR=~/compilDIR=/fcoptPYDIR=$DIR/PYTHON/$PYVERmkdir -p $CDIRcd $CDIR
wget https://www.python.org/ftp/python/$PYVER/Python-$PYVER.tar.xztar -Jxf Python-$PYVER.tar.xz
cd Python-$PYVER./configure --enable-shared --enable-optimizations --with-ensurepip=install --prefix=$PYDIR
- The option –enable-shared is needed when building VTK python wrapper.
- The option –enable-optimizations ensure to have an optimized version of Python. This option is
time consuming as it requires running a lot of tests (approximatively 30 minutes on my computer).
To quickly try Python compilation process, do not use this option !
- The option –with-ensurepip=install permits the installation of setuptools and pip packages.
Thereafter the make command is used by using 8 threads (ususally use as maximum the number of core of your
computer)
it is important to ensure that there are no important missing modules by reading last lines (before tests
starting with –enable-optimizations option) of the output of previous make command. There is what I obtain
on my computer :
...Python build finished, but the necessary bits to build these modules were not found:
_bsddb bsddb185 dlimageop sunaudiodev
To find the necessary bits, look in setup.py in detect_modules() for the module’s name....
These missing modules are not not needed in the following (and they are obsolete !). Some other missing modules
can be found. There are some of them and the corresponding CentOS packages to install with
sudo yum install <package_name> command :
| missing modules | packages |
|
|
| |
| _tkinter | tk-devel |
| _gdbm and _dbm | gdbm-devel |
| _sqlite3 | sqlite-devel |
| _lzma | xz-devel |
If some CentOS packages are installed to prevent missing modules one has to rerun the configure command the
make command.
At last one can install Python under $PYDIR directory
On March 2018, packages installed with this Python installation are pip-9.0.1 and setuptools-28.8.0.
To correctly use and test this installed python version
export PATH=$PYDIR/bin:/usr/bin:/binexport PYTHONPATH=$PYDIR/lib/python${PYVER%.*}/site-packages
export LD_LIBRARY_PATH=$PYDIR/lib
With PYVER=3.6.4, ${PYVER%.*} is 3.6 and ${PYVER%%.*} is 3.
To test the installation, I use pip to install ipython package :
$PYDIR/bin/pip${PYVER%%.*} install ipython
Installing VTK
$PYDIR/bin/pip${PYVER%%.*} install VTK
On march 2018, the version 8.1.0 is installed. One can run the python code sphere.py (700 bytes) to test the
VTK Python package installation (with PATH, PYTHONPATH and LD_LIBRARY_PATH correctly sets) :
wget http://www.math.univ-paris13.fr/~cuvelier/docs/Informatique/Python/sphere.py
$PYDIR/bin/python${PYVER%%.*} sphere.py
Installing PyQt5
$PYDIR/bin/pip${PYVER%%.*} install PyQt5
On march 2018, the version 5.10.1-5 is installed. One can run the python code pyqt5_window.py (656
bytes)
wget http://www.math.univ-paris13.fr/~cuvelier/docs/Informatique/Python/pyqt5_window.py
$PYDIR/bin/python${PYVER%%.*} pyqt5_window.py
Installing matplotlib, numpy, ...
I choose to install matplotlib package after the installation of PyQt.
$PYDIR/bin/pip${PYVER%%.*} install numpy scipy matplotlib
Installing mayavi
$PYDIR/bin/pip${PYVER%%.*} install mayavi
The mayavi-4.5.0 python package is now installed (march 2018). If the installed version is great than or equal to
4.5.1 (not yet available on march 2018) then nothing else is needed.
Otherwise, one has to upgrade version 4.5.0 to a version >= 4.5.1 by using Enthought developement version of
Mayavi, pyface and traitsui Python packages.
$PYDIR/bin/pip${PYVER%%.*} install git+https://github.com/enthought/mayavi.git
$PYDIR/bin/pip${PYVER%%.*} install git+https://github.com/enthought/pyface.git
$PYDIR/bin/pip${PYVER%%.*} install git+https://github.com/enthought/traitsui.git
To quickly test the mayavi package, one can run the python code mayavi_boy.py (774 bytes) .
wget http://www.math.univ-paris13.fr/~cuvelier/docs/Informatique/Python/mayavi_boy.py
$PYDIR/bin/python${PYVER%%.*} mayavi_boy.py
