Data from branches

[jalopezg]

Hi @Revan,

@Revan

TClass::Init:0: RuntimeWarning: no dictionary for class HepMCEvent is available
TClass::Init:0: RuntimeWarning: no dictionary for class Event is available
TClass::Init:0: RuntimeWarning: no dictionary for class Weight is available
TClass::Init:0: RuntimeWarning: no dictionary for class GenParticle is available
TClass::Init:0: RuntimeWarning: no dictionary for class SortableObject is available
TClass::Init:0: RuntimeWarning: no dictionary for class Track is available
TClass::Init:0: RuntimeWarning: no dictionary for class Tower is available
TClass::Init:0: RuntimeWarning: no dictionary for class Jet is available
TClass::Init:0: RuntimeWarning: no dictionary for class MissingET is available
TClass::Init:0: RuntimeWarning: no dictionary for class Electron is available
TClass::Init:0: RuntimeWarning: no dictionary for class Photon is available
TClass::Init:0: RuntimeWarning: no dictionary for class Muon is available
TClass::Init:0: RuntimeWarning: no dictionary for class ScalarHT is available

In regard to these warnings, you will have to load the corresponding dictionary file that provides information for the abovementioned classes.

@Revan

raceback (most recent call last):
  File "/Users/npolishetty/PycharmProjects/SandBoxROOT/ROOTRunner3_copy.py", line 28, in <module>
    collision.m1.SetPtEtaPhiM(entry.Muon.Muon.PT, entry.Muon.Muon.Eta, entry.Muon.Muon.Phi, 0.1)
AttributeError: 'TClonesArray' object has no attribute 'Muon'

Accessing a branch whose name contains dots (.) in this way is not supported. Specifically, for the Muon.pt part at the end, Python is parsing it as get an attribute named Muon, then get an attribute named pt.
In this case, you should use the workaround mentioned in Looping tree and getting branch value, but branch has a dot(.) in its name - #6 by etejedor.

Cheers,
J.