import ROOT
ROOT.gROOT.SetStyle("Plain")
r1 = ROOT.TRandom()
r2 = ROOT.TRandom3()
r1.SetSeed(123456);
r2.SetSeed(123456);

entries = [1000, 100000, 1000000]
for e in entries:
  h1 = ROOT.TH1D("h1_" + str(e), "TRandom, " + str(e) + " entries", 100, 0, 1);
  h2 = ROOT.TH1D("h2_" + str(e), "TRandom3, " + str(e) + " entries", 100, 0, 1);
  for i in range(1, e):
    h1.Fill(r1.Uniform())
    h2.Fill(r2.Uniform())
  c = ROOT.TCanvas()
  h1.SetMinimum(0.0)
  h1.Draw()
  c.SaveAs("01-rndTRandom2-" + str(e) + ".pdf")
  h2.SetMinimum(0.0)
  h2.Draw()
  c.SaveAs("01-rndTRandom3-" + str(e) + ".pdf")