no, the python chunks are connected. And with reticulate they are connected to R through the py object.
Here's a github gist illustrating the connection:
https://gist.githubusercontent.com/CerebralMastication/e8f7ddc02e081741e6eb25ddf2f94ca5/raw/1cce8c03048a1c86282312318cc95c11509cb963/Python_R_together.Rmd