Initial summary:
arandr fails to start in TW and 15.1

# inxi -S
System:    Host: p5bse Kernel: 5.6.14-1-default x86_64 bits: 64 Desktop: KDE 3
           Distro: openSUSE Tumbleweed 20200528
# arandr
Traceback (most recent call last):
  File "/usr/bin/arandr", line 41, in <module>
    from screenlayout.gui import main
  File "/usr/lib/python3.8/site-packages/screenlayout/gui.py", line 28, in
<module>
    gi.require_version('Gtk', '3.0')
  File "/usr/lib64/python3.8/site-packages/gi/__init__.py", line 129, in
require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gtk not available

# arandr
Traceback (most recent call last):
  File "/usr/bin/arandr", line 41, in <module>
    from screenlayout.gui import main
  File "/usr/lib/python3.6/site-packages/screenlayout/gui.py", line 27, in
<module>
    import gi
ModuleNotFoundError: No module named 'gi'
# zypper -v in arandr
Verbosity: 2
Non-option program arguments: 'arandr'
...
Force resolution: No
'arandr' is already installed.
No update candidate for 'arandr-0.1.10-lp151.18.1.noarch'. The highest
available
version is already installed.
Resolving package dependencies...
Force resolution: No

Nothing to do.
# zypse randr
   | krandr              | package    | 4.11.22-lp151.9.5 | x86_64 | OSS
   | libXrandr2-32bit    | package    | 1.5.1-lp151.3.3   | x86_64 | OSS
   | libxcb-randr0-32bit | package    | 1.13-lp151.3.2    | x86_64 | OSS
   | lxrandr             | package    | 0.3.1-lp151.2.3   | x86_64 | OSS
   | lxrandr-lang        | package    | 0.3.1-lp151.2.3   | noarch | OSS
i  | libXrandr2          | package    | 1.5.1-lp151.3.3   | x86_64 | OSS
i  | libxcb-randr0       | package    | 1.13-lp151.3.2    | x86_64 | OSS
i+ | xrandr              | package    | 1.5.0-lp151.3.3   | x86_64 | OSS
il | arandr              | package    | 0.1.10-lp151.18.1 | noarch |
X11Utilities
# rpm -qi arandr
Name        : arandr
Version     : 0.1.10
Release     : lp151.18.1
Architecture: noarch
Install Date: Sun Mar 15 20:57:17 2020
Group       : Unspecified
Size        : 356081
License     : GPL-3.0-only
Signature   : DSA/SHA1, Mon Jan 13 13:49:33 2020, Key ID bb1af2330f2672c8
Source RPM  : arandr-0.1.10-lp151.18.1.src.rpm
Build Date  : Mon Jan 13 13:49:23 2020
Build Host  : lamb62
Relocations : (not relocatable)
Vendor      : obs://build.opensuse.org/X11
URL         : https://christian.amsuess.com/tools/arandr/
Summary     : Visual Front End for XRandR
Description :
ARandR is designed to provide a simple visual front end for XRandR. Relative
monitor positions are shown graphically and can be changed in a drag-and-drop
way.
Distribution: X11:Utilities / openSUSE_Leap_15.1
# rpm -q --changelog arandr | grep @
* Sun Dec 15 2019 Stefan Seyfried <seife+obs@b1-systems.com>
* Sun Oct 13 2019 Avindra Goolcharan <avindra@opensuse.org>
* Wed Mar 21 2018 seife+obs@b1-systems.com
* Wed Mar 02 2016 mvetter@suse.com