Getting Data from Python to R using Reticulate

I use the reticulate R to Python interface quite regularly. Besides the yelling when a numeric is once again converted to float, the transfer-time of pandas DataFrames with their memory usage has been a regular topic. To get some data and maybe a definitive answert to the question “What is the best way to transfer tabular data from Python to R?” I set up a pair of tiny scipts. tl;dr: It depends.