clean_bg_file.py

#!/usr/bin/env python3
 
 
 
# remove empty events from beam background data files.
 
import basf2 as b2
from ROOT import Belle2
 
 
class SVDTrigger(b2.Module):
 
    """Returns 1 if current event contains at least one SVDSimHit or one
       SVD-related BeamBackHit, 0 otherwise"""
 
    def initialize(self):
        """reimplementation of Module::initialize()."""
 
    def event(self):
        """reimplementation of Module::event()."""
 
        self.return_value(0)
        simhits = Belle2.PyStoreArray('SVDSimHits')
        bghits = Belle2.PyStoreArray('BeamBackHits')
        if len(simhits) > 0 or len(bghits) > 0:
            self.return_value(1)
 
 
main = b2.create_path()
 
input = b2.register_module('RootInput')
main.add_module(input)
 
 
trigger = SVDTrigger()
main.add_module(trigger)
 
# if SVDTrigger returns 0, we'll jump into an empty path
# (skipping output)
emptypath = b2.create_path()
trigger.if_false(emptypath)
 
 
output = b2.register_module('RootOutput')
main.add_module(output)
 
main.add_module(b2.register_module('ProgressBar'))
 
b2.process(main)
 
print(b2.statistics)