Unable to get Root from Conda to start using pyroot for python scripts

Newbie
, ,
1

ROOT Version: not yet installed
Platform: Windows

Hello,

I’m getting started with ROOT and I’m looking to use it with python for my work. But I can’t seem to install it in a wat that it could be used for python. I tried basically all the variations of install -c conda-forge root and Anaconda doesn’t seem able to locate the packages. I get the following error:

PackagesNotFoundError: The following packages are not available from current channels:

  • root

From what I’ve seen, everyone seemed able to get Root via this method and I feel a bit lost. Any help would be appreciated.

2

Welcome to the ROOT Forum!
AFAIK, ROOT is not available via conda on Windows. You have to download a pre-compiled binary or build it from source.

3

So I already have root installed on my computer and it works separately from python. I’ve been trying to import root in a python application and it doesn’t work. Both python and root work perfectly in a separate manner but once I import root in python, it tells me that no module is named ‘root’.

I’m working with vscode if that matters.

4

Did you call root\bin\thisroot.bat before starting your Python session?
And make sure you use the same version of Python than ROOT (root-config --python-version)

5

Yes both are x64 and I have called thisrrot.bat before the session. the error keeps coming …

6

Can you copy and paste your session here together with the output of echo %ROOTSYS%? Something like:

C:\root-dev\git\roottest>echo %ROOTSYS%
C:\root-dev\build\x64\debug

C:\root-dev\git\roottest>python
Python 3.11.4 (tags/v3.11.4:d2340ef, Jun  7 2023, 05:45:37) [MSC v.1934 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
>>>
7

Something like this:

C:\Users\Admin>echo %ROOTSYS%
%ROOTSYS%

C:\Users\Admin>python
Python 3.11.7 (tags/v3.11.7:fa7a6f2, Dec  4 2023, 19:24:49) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'ROOT'
>>>
8

So you didn’t call root\bin\thisroot.bat

9

I’m getting this when I call thisrrot.bat before

C:\Users\Admin> C:\Users\Admin\root_v6.30.02\bin\thisroot.bat

C:\Users\Admin>%ROOTSYS%
'C:\Users\Admin\root_v6.30.02' is not recognized as an internal or external command,
operable program or batch file.
10

You forgot echo… Try again with:

C:\Users\Admin> C:\Users\Admin\root_v6.30.02\bin\thisroot.bat

C:\Users\Admin>echo %ROOTSYS%

And then you can start Python and import ROOT

11

I’m so sorry.

C:\Users\Admin>echo %ROOTSYS%
C:\Users\Admin\root_v6.30.02

and now I’m getting this new error:

 C:\Users\Admin>python
Python 3.11.7 (tags/v3.11.7:fa7a6f2, Dec  4 2023, 19:24:49) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
Fatal in <TROOT::InitInterpreter>: cannot load library The specified module could not be found.
13

OK, I see you’re using Python 3.11, and as you can see, the pre-built binary uses Python 3.8:

C:\root-dev\rootdev\test>root-config --python-version
 3.8.10

So it won’t work. You have to either use Python 3.8, or build ROOT from source with a newer version of Python.

14

But when I personally run this, I get:

C:\Users\Admin>root-config --python-version
3.11.2

C:\Users\Admin>

So it should be ok since I’m using the same version of python, no?

15

I think so