reusing Particle.__str__ seem not to work. better would be to have a …

…free function baseP4Printing to be shared for different cases

PhysicsTools/Heppy/python/physicsobjects/GenParticle.py

@@ -3,10 +3,15 @@
 #add __str__ to reco::GenParticle python wrapper
 import ROOT
 def printGenParticle(self):
-        base = basePrint(self)
+        tmp = '{className} : {pdgId:>3}, pt = {pt:5.1f}, eta = {eta:5.2f}, phi = {phi:5.2f}, mass = {mass:5.2f}'
+        base= tmp.format( className = self.__class__.__name__,
+                           pdgId = self.pdgId(),
+                           pt = self.pt(),
+                           eta = self.eta(),
+                           phi = self.phi(),
+                           mass = self.mass() )
         theStr = '{base}, status = {status:>2}'.format(base=base, status=self.status())
         return theStr
-setattr(ROOT.reco.GenParticle,"basePrint",Particle.__str__)
 setattr(ROOT.reco.GenParticle,"__str__",printGenParticle)
 
 from ROOT.reco import GenParticle