new_contents: ## \file
  ## \ingroup tutorial_pyroot
  ## \notebook -nodraw
  ## This tutorial illustrates the pretty printing feature of PyROOT, which reveals
  ## the content of the object if a string representation is requested, e.g., by
  ## Python's print statement. The printing behaves similar to the ROOT prompt
  ## powered by the C++ interpreter cling.
  ##
  ## \macro_code
  ##
  ## \date June 2018
  ## \author Stefan Wunsch
  
  import ROOT
  
  # Create an object with PyROOT
  obj = ROOT.std.vector("int")(3)
  for i in range(obj.size()):
      obj[i] = i
  
  # Print the object, which reveals the content. Note that `print` calls the special
  # method `__str__` of the object internally.
  print(obj)
  
  # The output can be retrieved as string by any function that triggers the `__str__`
  # special method of the object, e.g., `str` or `format`.
  print(str(obj))
  print("{}".format(obj))
  
  # Note that the interactive Python prompt does not call `__str__`, it calls
  # `__repr__`, which implements a formal and unique string representation of
  # the object.
  print(repr(obj))
  obj
  
  # The print output behaves similar to the ROOT prompt, e.g., here for a ROOT histogram.
  hist = ROOT.TH1F("name", "title", 10, 0, 1)
  print(hist)
  
subject: Add tutorial for pretty printing feature