All installation methods assume you already have a Python 3.4 or more recent on your system.
Note that if you have all the requirements pre-installed on your system, it is not necessary to use the setup.py script to use Wapiti : just extract the archive and launch the "wapiti" command line in the "bin" folder :
./bin/wapiti or python bin/wapiti.
You may want to install Wapiti to the system just to make access easier.
If you haven't sufficient privileges are you are afraid of beaking some dependencies in your python packages then
using a virtual environment is the way to go. Just refer to the related section.
Otherwise you will have to launch setup.py as a privileged user.
Enjoy Wapiti.
The hard part of the installation may be to get libxml (plus development files) on your system. Libxml2 is the parser used by default in Wapiti. It's fast hence recommended.
Installation commands for several operating systems can be found above.
If the installation fails at some point you can opt-out by giving the --with-html5lib option to the setup.py script.
This way Wapiti will rely on html5lib (another parser, lenient but slower) instead.
Feel free to report every installation problem.
Let's create a virtual environment called 'wapiti3'.
In this example it will be created in the current working directory.
python -m venv wapiti3
Now let's activate it (make it our current working environnement) :
. ./wapiti3/bin/activate
Or alternatively on Windows :
wapiti3\Scripts\activate.bat
Now you are in the virtual environment you can install Wapiti and its dependencies :
python3 setup.py install
To leave the virtual environnement just call the following command :
deactivate
Remember that you will need to reactivate the environment each time you want to use Wapiti.
sudo apt-get install python3-venv libxml2 libxml2-dev libz-dev libxslt1-dev python3-dev
Full video tutorial: https://www.youtube.com/watch?v=TD5rehelHPY
sudo zypper install libxml2-2 libxml2-devel libxslt1 libxslt-devel gcc python3-devel
Full video tutorial: https://www.youtube.com/watch?v=RmF2Sr2B3ZA
sudo pacman -S libxml2
sudo yum install gcc libxml2-devel libxslt-devel redhat-rpm-config python3-devel
Full video tutorial: https://www.youtube.com/watch?v=j3LCVj15VBE
First make sure you have installed python3 on your computer and that path to the installation path was added to your PATH environment variable (Python installer should do that by default).
Installing libxml2 on Windows would normally require downloading and installing several gigabytes of MS development tools with much pain.
Fortunately some non-official pre-built Python extensions for lxml are available.
Download the appropriate whl file for lxml from the following webpage :
https://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
Make sure to download to good wheel archive. For example if you are using Python 3.6 on a 64bits architecture then to good wheel file should be lxml‑4.1.1‑cp36‑cp36m‑win_amd64.whl.
Then install the wheel file using pip (adjust the name of the file based on your needs):
pip3 install lxml‑4.1.1‑cp36‑cp36m‑win_amd64.whl
That's it !
Now that libxml2 is installed on the system you just have yo install wapiti this way :
python setup.py install
Or if you skipped the libxml2 installation :
python setup.py install --with-html5lib