doc: explicitly refer to python3

as indicated in #426

doc/source/contributor.rst

@@ -138,7 +138,7 @@ Code Comments
 Code comments for variables should be used to explain the purpose of the
 variable.
 
-Code comments for bash/python scripts should give guidance to the purpose of
+Code comments for Bash/Python3 scripts should give guidance to the purpose of
 the code. This is important to provide context for reviewers before the patch
 has merged, and for later modifications to remind the contributors what the
 purpose was and why it was done that way.

doc/source/deployment/setup-deployer.rst

@@ -140,7 +140,7 @@ configuration file loading ARA plugins:
 
 .. code-block:: console
 
-   python -m ara.setup.ansible | tee ~/.ansible.cfg
+   python3 -m ara.setup.ansible | tee ~/.ansible.cfg
 
 For more details on the ARA web interface, see
 https://ara.readthedocs.io/en/stable/webserver.html.

doc/source/reference.rst

@@ -121,7 +121,7 @@ situated in `openstack/loci/`. The `build.sh` script is a thin wrapper around
 Container Initiative (OCI) compliant images of OpenStack projects. It uses
 `docker build` to construct images from OpenStack sources. Their requirements
 are expressed in `bindep` files (`bindep.txt` for rpm/apt packages, `pydep.txt`
-for python packages). The `build.sh` script runs `LOCI` for the master branch.
+for Python3 packages). The `build.sh` script runs `LOCI` for the master branch.
 Other branches can be built using `build-{branchname}.sh` where `branchname` is
 the name of the OpenStack release (for example, `rocky`). See also :ref:`buildlociimages`.
 
@@ -320,7 +320,7 @@ not. This adds a step for patching upstream code, builds images and then
 continues the deployment.
 
 ``SOCOK8S_USE_VIRTUALENV`` determines if the script should set up and use a
-virtualenv for python and ansible requirements. Without this it is expected
+virtualenv for Python3 and Ansible requirements. Without this it is expected
 that ansible and the requirements are installed via system packages.
 When ``SOCOK8S_DEVELOPER_MODE`` is set to True, this defaults to True, otherwise
 this defaults to False.

doc/source/suse-ecp/ose-localhost.rst

@@ -59,20 +59,20 @@ Install the following software on your `localhost`:
   * jq
   * ipcalc
   * git
-  * python-virtualenv
+  * python3-virtualenv
 
 Optionally, `localhost` can be preinstalled with the following software:
 
   * ansible>=2.7.0
-  * python/python3-openstackclient
-  * python/python3-requests
-  * python/python3-jmespath
-  * python/python3-openstacksdk
-  * python/python3-netaddr
-
-Install the variant of the packages that matches the Python release that Ansible
-is using. (for example, on openSUSE Tumbleweed, Ansible uses Python 3, so install
-the "python3-" variant of the packages).
+  * python3-openstackclient
+  * python3-requests
+  * python3-jmespath
+  * python3-openstacksdk
+  * python3-netaddr
+
+SUSE Containerized OpenStack only supports the Python3 variant of packages.
+Generally, the `python` command invokes Python version 2, which will not work
+with SUSE Containerized OpenStack.
 
 If the optional software packages are not installed, they will be installed in a
 venv in |socok8s_workspace_default|\ `/.ansiblevenv`.