Rpy2 Install on Windows 7

Installing rpy2 on windows

The output contains the error:

'sh' is not recognized as an internal or external command

but I thought it was only a warning (as there was output coming after it).
sh (shell) is Nix specific and (naturally) doesn't exist on Win. However, if you install a port for Win, or an Lnx env emulator (like Cygwin), it might work.

Here's what [ReadTheDocs.rpy2]: Installation (which has "Compiling on Linux" and "Compiling on OS X" sections, but nothing about Win, although it mentions that it should compile successfully) states:

There is currently no binaries or support for Microsoft Windows (more for lack of resources than anything else).
Microsoft’s Windows - unofficial and unsupported binaries are provided by Christoph Gohlke (http://www.lfd.uci.edu/~gohlke/pythonlibs); there is otherwise currently close to no support for this platform

Update #0

Adding steps that @pyguy took (from comment), in order to successfully install rpy2:

Download rpy2‑2.9.3‑cp35‑cp35m‑win_amd64.whl (or any newer version that might have been added in the meantime) from [UCI.LFD]: Unofficial Windows Binaries for Python Extension Packages (for 32bit, download the *win32.whl)
Open a cmd window (as Administrator) in the .whl's download dir
Set R_USER env var to current username: set R_USER=%USERNAME%
python -m pip install rpy2‑2.9.3‑cp35‑cp35m‑win_amd64.whl (Python's (binary) dir must be in %PATH%, or specify the full path)

Error installing RPy2-2.3.8 on Windows 7, Python 3.3

RPy does not support Python 3.x. You have to use 2.5 <= Python < 3.0. See official documentation for details.

Installing rpy2

If you're desperate, you could install WinPython (for windows users) which has a lot of Packages already installed and ready to use, including rpy2, sometimes installing packages on windows can be stressful.

Or if you really want to make it work that way, maybe you could check if that package was installed in the Downloads folder and move it to the folder corresponding to python libraries

Rpy2 on windows

OLD ANSWER
The issue was that I downloaded the wrong wheel. cp37 means CPython 3.7 and I have python 3.6 on my system. I downloaded rpy2-2.9.5-cp36-cp36m-win_amd64.whl istead of rpy2-2.9.5-cp37-cp37m-win_amd64.whl and it worked.

Also as I faced problems with R_USERand R_HOME I did the following in my python script:

import os
# see the following 2 lines
os.environ['R_HOME'] = 'C:/Program Files/R/R-3.6.2'
os.environ['R_USER'] = 'C:/Users/96171/AppData/Local/Programs/Python/Python36/Lib/site-packages/rpy2' #path depends on where you installed Python. Mine is the site packages of the regular python installation, it could have been Anaconda

# importing rpy2
import rpy2.robjects as robjects
r = robjects.r
r['source']('sample_r.r')

References: this

UPDATED
To avoid os calls I was able to achieve the desired behavior by including R_USER and R_HOME to the SYSTEM VARIABLE in ENVIRONMENT VARIABLES

R_USER:
C:\Users\96171\AppData\Local\Programs\Python\Python36\Lib\site-packages\rpy2
R_HOME: C:\Program Files\R\R-3.6.2