Wikidata Integrator is a Python library that simplifies data integration from Wikidata (and other Wikibases). It is written in Python, is focused on Wikibase concepts (as opposed to some libraries which are MediaWiki focused) and has a user-friendly interface.
I’m currently working on a demo Wikibase and decided to bring all of the data into the Wikibase making use of a Jupyter notebook, and Wikidata integrator was my choice library to use for this task. (Jupyter notebooks are interactive coding environments that allow users to create and share documents containing live code, visualizations, and explanations.)
Along that journey I found the Wikidata Integrator documentation lacking slightly, but I managed to get initial property and item creation working with little effort. However, I couldn’t get properties to create with statements already on them (needed a subsequent edit instead).