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root:pyroot_tfile [2017/06/13 09:39] – iwnroot:pyroot_tfile [2017/09/05 10:35] – [Handling TFile files] iwn
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-===== Handling TFiles =====+[[root:root|Getting started with ROOT]] -> [[root:pyroot|Useful pyROOT snippets]] → [[root:pyroot_tfile|Handling TFile files]]
  
-==== Adding a directory to a TFile ====+====== Handling TFile files ====== 
 + 
 +Class references for: 
 +  * ''[[https://root.cern.ch/doc/master/classTFile.html|TDirectory]]'', 
 +  * ''[[https://root.cern.ch/doc/master/classTFile.html|TFile]]''. 
 + 
 +===== Adding a directory to a TFile =====
  
 Here is a basic example creating a file with on directory. If you want to create and save an object in this directory, e.g. a tree or histogram, use ''dir.cd()''. Pay attention to the order of creating an object, changing directory (''cd()'') and writing the object! Here is a basic example creating a file with on directory. If you want to create and save an object in this directory, e.g. a tree or histogram, use ''dir.cd()''. Pay attention to the order of creating an object, changing directory (''cd()'') and writing the object!
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-==== gDirectory ====+===== gDirectory =====
  
-Note that ''gDirectory'' is the current directory containing all newly created saved objects, or those saved to this directory. If you just opened a file, this will be your current directory until you close it or use ''cd()''. Test the behavior:+Note that ''gDirectory'' is the current directory containing all newly created saved objects, or those saved to this directory. If you just opened a file, this will be your current directory until you close it or use ''cd()'' on some ''TDirectory'' or other ''TFile''. Test the behavior with this macro:
  
 <file python gDirectory.py> <file python gDirectory.py>
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 printGDirectory() printGDirectory()
  
-print ">>> creating some file with some contents"+print ">>> creating a file with some contents"
 file = TFile("test.root","recreate") file = TFile("test.root","recreate")
 tree = TTree("tree","tree") tree = TTree("tree","tree")
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 printGDirectory() printGDirectory()
 </file> </file>
- 
  
root/pyroot_tfile.txt · Last modified: 2017/09/05 10:37 by iwn

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