def main():
""" Testing procedure: plot all graphs in a ROOT file. """
TFile.getkeynames = getkeynames
myfile = TFile('input_data.root')
gROOT.SetBatch(True)
for name in myfile.getkeynames():
graph = myfile.Get(name)
if type(graph) is not TGraphErrors:
continue
graph.Draw()
gPad.SaveAs("images/" + name + '.png')
gPad.Clear()
