Google Colaboratory supports Python version 2.7 and 3.6
I see an example how to use Swift in Colab a while ago.
Today, I happened to run
!jup
In case you want to use Python and R together, you can use R magic for some cells.
# activate R magic %load_ext rpy2.ipython
Then, whenever you want to use R, you begin the cell with %%R
%%R
%%R x <- 42 print(x)
More details in rpy2 documentation