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/*!
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\page PhysicsTools_PythonAnalysis Package PhysicsTools/PythonAnalysis
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<center>
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<small>
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<a href=http://cmsdoc.cern.ch/swdev/viewcvs/viewcvs.cgi/CMSSW/PhysicsTools/PythonAnalysis/?cvsroot=CMSSW>CVS head for this package</a> -
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<a href=http://cmsdoc.cern.ch/swdev/viewcvs/viewcvs.cgi/CMSSW/PhysicsTools/PythonAnalysis/developers?rev=HEAD&cvsroot=CMSSW&content-type=text/vnd.viewcvs-markup>Administrative privileges</a>
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</small>
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</center>
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\section desc Description
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<!-- Short description of what this package is supposed to provide -->
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Examples of using CMSSW in Python.
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Some helper routines for startup, tab completion and shorter syntax.
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\subsection interface Public interface
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- <b>cmstools</b>: public interface to all modules.
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\subsection modules Modules
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- <b>cmstools.py</b>: prepares environment and defines some commands
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- <b>cmscompleter.py</b>: class for tab completion
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- <b>namespaceDict.py</b>: builds the FWLite namespace (without loading libs)
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\subsection tests Unit tests and examples
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- <b>interactive use</b>: all libraries are loaded automatically when needed. To start set the environment variable <tt>PYTHONPATH</tt>:
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\htmlonly
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<pre>
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export PYTHONPATH=$CMSSW_BASE/src/PhysicsTools/PythonAnalysis/python:$PYTHONPATH (bash)
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setenv PYTHONPATH $CMSSW_BASE/src/PhysicsTools/PythonAnalysis/python:$PYTHONPATH (csh)
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</pre>
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\endhtmlonly
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fire up the python interpreter
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\htmlonly
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<pre>
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python
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</pre>
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\endhtmlonly
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and import cmstools and ROOT:
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\htmlonly
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<pre>
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from cmstools import *
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from ROOT import *
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</pre>
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\endhtmlonly
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That's it.
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- <b>MCTruth.py</b>: Reads gen event information and prints event number
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- <b>trackerHits.py</b>: Reads sim event information and creates the files <tt>histo.root</tt>
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and <tt>tofhits.jpg</tt>.
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\htmlonly
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<ol>
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<li>Prepare the environment and load the cms module:
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<pre>
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from cmstools import *
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from ROOT import *
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</pre>
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<li>Open ROOT file and access branch:
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<pre>
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file = TFile('simevent.root')
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events = file.Get('Events')
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branch = events.GetBranch('PSimHit_r_TrackerHitsTIBLowTof.obj')
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simHit = std.vector(PSimHit)()
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branch.SetAddress(simHit)
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</pre>
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<li>Prepare histogram and loop over all events to fill it
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<pre>
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histo = TH1F('tofhits', 'Tof of hits', 100, -0.5, 50)
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for ev in all(events):
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branch.GetEntry(ev)
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for hit in all(simHit):
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histo.Fill(hit.timeOfFlight())
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</pre>
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<li>Save histogram in a file:
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<pre>
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hFile = TFile('histo.root', 'RECREATE')
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histo.Write()
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</pre>
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<li>Plot histogram as a jpg-file:
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<pre>
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gROOT.SetBatch()
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gROOT.SetStyle('Plain')
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c = TCanvas()
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histo.Draw()
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c.SaveAs('tofhits.jpg')
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</pre>
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</ol>
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\endhtmlonly
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- <b>howto.txt</b>: short explanation
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\section status Status and planned development
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<!-- e.g. completed, stable, missing features -->
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Prototype.
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<hr>
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hegner |
1.4 |
Last updated: 23-MAR-2006 B. Hegner
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*/
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