Loading histograms in a loop

ROOT
1

Hi,

I’m trying to open some histograms in a loop, but keep on getting objects of None Type. Here is the code:

root_files = ["file1.root", "file2.root", "file3.root"] for i in range (len(root_files)): f = TFile(root_files[i]) h = f.Get("myHisto") SetOwnership(h,0) l.append(h)

I find that the first two items in the list l are of None type, the last is the histogram as intended. I’ve played around with SetOwnership, but it doesn’t seem to help.

2

use h.SetDirectory(0) to keep it from being deleted when the file closes

3

That works great, thanks very much!