The first lines I run when launching my rstudio session are:
library(reticulate)
use_python("/usr/local/lib/python3.6/site-packages")
However, when I run py_config() it shows as still using the default python 2.7 installation.
This is an issue b.c I'm unable to import any modules that were installed for python3. Any idea why this isn't working? I followed documentation fairly closely.
I observed that neither the technique "use_python('path')" nor the tactic of Sys.setenv(RETICULATE_PYTHON = 'path') in .RProfile worked for me (of course I am sure it must have worked for others.)
In any case the line at terminal,
which -a python python3
did produce two paths to choose from (one for python2 and one for python3 installed on my mac), so then I was able to create a ".Renviron" file in my home directory with this single line in it:
RETICULATE_PYTHON="/usr/local/bin/python3"
After I restarted RStudio, library(reticulate) activates the desired python3, and repl_python() opens a python3 interactive window, etc. etc.
来源：https://stackoverflow.com/questions/50145643/unable-to-change-python-path-in-reticulate-r