##
3.21.2 Subclassing Repr Objects

The use of dynamic dispatching by `Repr.repr1()` allows subclasses of `Repr` to add support for additional built-in object types or to modify the handling of types already supported. This example shows how special support for file objects could be added:

      import repr
      import sys

      class MyRepr(repr.Repr):
          def repr_file(self, obj, level):
              if obj.name in ['<stdin>', '<stdout>', '<stderr>']:
                  return obj.name
              else:
                  return `obj`

      aRepr = MyRepr()
      print aRepr.repr(sys.stdin)          # prints '<stdin>'