Workaround pythonizations changing mutability of objects

scripts/createEDM4hepFile.py

@@ -29,8 +29,10 @@ def create_MCParticleCollection():
  """Create an MCParticleCollection"""
  counter = count()
  particles = edm4hep.MCParticleCollection()
+ p_list = []
  for i in range(3):
  particle = particles.create()
+ p_list.append(particle)
  particle.setPDG(next(counter))
  particle.setGeneratorStatus(next(counter))
  particle.setSimulatorStatus(next(counter))
@@ -52,8 +54,8 @@ def create_MCParticleCollection():
  particle.setSpin(edm4hep.Vector3f(next(counter), next(counter), next(counter)))
  particle.setColorFlow(edm4hep.Vector2i(next(counter), next(counter)))
 
- particles[0].addToDaughters(particles[1])
- particles[0].addToParents(particles[2])
+ p_list[0].addToDaughters(p_list[1])
+ p_list[0].addToParents(p_list[2])
  return particles
 
 
@@ -151,7 +153,7 @@ def create_ParticleIDCollection(vectorsize):
  for j in range(vectorsize):
  pid.addToParameters(next(counter))
 
- return pids
+ return pids, pid
 
 
 def create_ClusterCollection(vectorsize, calo_hit):
@@ -273,7 +275,7 @@ def create_VertexCollection(vectorsize):
  v.setAlgorithmType(next(counter))
  for j in range(vectorsize):
  v.addToParameters(next(counter))
- return vertex
+ return vertex, v
 
 
 def create_ReconstructedParticleCollection(vertex, cluster, track):
@@ -430,11 +432,9 @@ def create_frame():
  )
  track = tracks[0]
 
- pids = create_ParticleIDCollection(VECTORSIZE)
- pid = pids[0]
+ pids, pid = create_ParticleIDCollection(VECTORSIZE)
 
- vertices = create_VertexCollection(VECTORSIZE)
- vertex = vertices[0]
+ vertices, vertex = create_VertexCollection(VECTORSIZE)
 
  reco_particles = frame.put(
  create_ReconstructedParticleCollection(vertex, cluster, track),