Rpy2 Cannot Find R.dll [duplicate]

Answer 1

Last night I made an rpy2 install pdf which addresses this issue -- either R, Pyhton, pywin32 or rpy2 linked in the PATH are most likely not 32-bit.

Maybe it will help - rpy2pandas.pdf

(Only thing is I have Python in C:/Python27/ArcGIS10.2/python.exe, otherwise everything else should port.)

Answer 2

I struggled with this problem multiple times and found a maybe not so elegant, but rather simple workaround to this whole can't import rpy2 story. If you are also tired of messing with env variables, then just set it in a small python script which you can import at the beginning. First get the rpy2 .whl package and install it according to https://stackoverflow.com/a/32983656/6912069 Then just creat a small python script which you import at the beginning of your other python scripts which depend on rpy2. For me this worked out:

from __main__import *
import os
os.environ['PYTHONHOME'] = 'C:/Program Files/Python'
os.environ['PYTHONPATH'] = 'C:/Program Files/Python/lib/site-packages'
os.environ['R_HOME'] = 'C:/Program Files/R/R-3.5.1'
os.environ['R_USER'] = 'C:/Program Files/Python/Lib/site-packages/rpy2'

# importing rpy2 now throws no errors
import rpy2.robjects as ro

When importing this script at the beginning of my main python script, I can use the rpy2 package and control R from within Python.