reticulate
In reticulate: Interface to 'Python'

Change the knit root directory to the temporary R session. See https://github.com/rstudio/reticulate/issues/1526 for context.

knitr::opts_knit$set("root.dir" = tempdir())

getwd()

library("reticulate")
matplotlib <- import("matplotlib")

reticulate::py_config()

The R plot is saved relative to the location of the Rmd file:

plot(1:10)

The Python plot is also saved relative to the location of the Rmd file (not root.dir):

```{python py-plot} import matplotlib.pyplot as plt

x = range(1, 10) plt.plot(x, x)

```r
knitr::opts_knit$get("root.dir")
knitr::opts_knit$get("base.dir") 
knitr::opts_knit$get("output.dir")

if (length(Sys.glob(paste0(knitr::opts_knit$get("root.dir"), "/figure*/*"))))
  stop("Figures saved in the wrong dir")

if (!setequal(
  basename(Sys.glob(paste0(knitr::opts_knit$get("output.dir"), "/figure*/*"))),
  c("r-plot-1.png", "py-plot-1.png")))
  stop("Figures not found in expected output.dir")

if( file.exists(file.path(knitr::opts_knit$get("root.dir"), "figure", "r-plot-1.png")))    stop("figure saved in wrong place1")
if( file.exists(file.path(knitr::opts_knit$get("root.dir"), "figure", "py-plot-1.png")))   stop("figure saved in wrong place2")
if(!file.exists(file.path(knitr::opts_knit$get("output.dir"), "figure", "r-plot-1.png")))  stop("figure saved in wrong place3")
if(!file.exists(file.path(knitr::opts_knit$get("output.dir"), "figure", "py-plot-1.png"))) stop("figure saved in wrong place4")