I'm a bit unclear on the details but python-3.11 with pip-23.2.1 on CentOS7 is refusing to install txpostgres for me:
pip install txpostgres
ERROR: Could not find a version that satisfies the requirement txpostgres (from versions: none)
ERROR: No matching distribution found for txpostgres
Maybe related to:
pypa/pip#8559
It installs correctly with python-3.9 and pip-23.2.1 on the same machine.