使用PyRoot以root身份读取TTree [英] Reading a TTree in root using PyRoot

问题描述

我刚刚开始使用pyroot读取根文件，而无法使用jupyter notebook从文件中读取数据. TBrowser的外观如下:

I just started using pyroot to read root files and I can't read the data from a file using jupyter notebook. Here is how the TBrowser looks like:

我是这样开始的:

import ROOT as root
import numpy as np

f = root.TFile("RealData.root")
myTree = f.Get("tree")

entries = myTree.GetEntriesFast()

到目前为止，它正在运行，如果我打印条目，我将得到文件中所包含的正确总数.但是我不知道如何从树中读取实际数据(event_number，n_channels等).如果我尝试使用类似myTree.events或myTree.event_number的方法，内核将停止工作.我应该怎么做才能从树中读取数据?

Up to here it is working and if I print entries I get the right number of entires I have in the file. But i don't know how to read actual data from the tree (event_number, n_channels, etc.) If I try something like myTree.events or myTree.event_number the kernel stops working. What should I do to read the data from the tree?

推荐答案

通常使用pyROOT，您可以执行以下操作:

Normally with pyROOT, you can just do something like:

import ROOT as root
import numpy as np

f = root.TFile("RealData.root")
myTree = f.Get("tree")
for entry in myTree:         
     # Now you have acess to the leaves/branches of each entry in the tree, e.g.
     events = entry.events

我对jupyter的工作方式了解不足，无法确定这是否会引起任何特定的问题.您是否尝试过使用常规的python解释器运行相同的脚本?

I don't know enough about how jupyter works to know if that would cause any particular problems. Have you tried running the same script just using a regular python interpreter?

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