Accessing leaves/branches in TFile

hello Pyroot support,

This seems like a very basic question, but could not find the answer anywhere. I have a TTree in a TFile that contains a few branches. Each branch name is just an identifier, and within each branch are several variables.
Structure looks like:


To access the mass and pt for each branch I tried:

[code]# Set the branch address of TTree in Tfile
evt = file.Get(“tree”)

Loop over over events in TFile

for iEvt in range(evt.GetEntries()):

print evt.Branch1.mass[/code]

I get the error:
TTree’ object has no attribute ‘Branch1’

Any idea how to access the leaves within the branches? Thanks in advance


what does evt.Print() give? I.e. is the branch really called ‘Branch1’?