CVS head for this package - Administrative privileges

Description

Examples of using CMSSW in Python. Some helper routines for startup, tab completion and shorter syntax.

Public interface

cmstools : public interface to all modules.

Modules

cmstools.py : prepares environment and defines some commands
cmscompleter.py : class for tab completion
namespaceDict.py : builds the FWLite namespace (without loading libs)
iterators.py > : decorator for adding iterators to some containers

Unit tests and examples

interactive use : all libraries are loaded automatically when needed. fire up the python interpreter
```
       python
      
```
and import cmstools and ROOT :
```
       from PhysicsTools.PythonAnalysis import *
from ROOT import *
      
```
That's it.
MCTruth.py : Reads gen event information and prints event number (root version)
MCTruth2.py : Reads gen event information and prints event number (using cmstools)

trackerHits.py : Reads sim event information and creates the files


       histo.root

and


       tofhits.jpg

.

Prepare the environment and load the cms module:

         from PhysicsTools.PythonAnalysis.cmstools import *
from ROOT import *

Open ROOT file and access branch:

         events = EventTree.('simevents.root')

Prepare histogram and loop over all events to fill it

         histo = TH1F('tofhits', 'Tof of hits', 100, -0.5, 50)

for event in events:
    simHits = event.getProduct('PSimHit_r_TrackerHitsTIBLowTof.obj')
    for hit in simHits:
        histo.Fill(hit.timeOfFlight())

Save histogram in a file:

         hFile = TFile('histo.root', 'RECREATE')
histo.Write()

Plot histogram as a jpg-file:

         gROOT.SetBatch()
gROOT.SetStyle('Plain')

c = TCanvas()
histo.Draw()
c.SaveAs('tofhits.jpg')

howto.txt : short explanation

Status and planned development

Prototype.

For more details, refer to the Analysis Tools TWiki on the Software Guide.

Last updated: 03-MAR-2007 B. Hegner