eventsfwlite.py

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from DataFormats.FWLite import Events as FWLiteEvents

class Events(object):
    def __init__(self, files, tree_name,  options=None):
    if options is not None :
        if not hasattr(options,"inputFiles"):
            options.inputFiles=files
        if not hasattr(options,"maxEvents"):
            options.maxEvents = 0   
        if not hasattr(options,"secondaryInputFiles"):
            options.secondaryInputFiles = []
            self.events = FWLiteEvents(options=options)
    else :
            self.events = FWLiteEvents(files)

    def __len__(self):
        return self.events.size()

    def __getattr__(self, key):
        return getattr(self.events, key)

    def __getitem__(self, iEv):
        self.events.to(iEv)
        return self