class_docstr: subclass of repr.Repr that limits the resulting size of repr()
  and includes information on exceptions raised during the call.
code: def _callhelper(self, call, x, *args):
      try:
          # Try the vanilla repr and make sure that the result is a string
          s = call(x, *args)
      except py.builtin._sysex:
          raise
      except:
          cls, e, tb = sys.exc_info()
          exc_name = getattr(cls, "__name__", "unknown")
          try:
              exc_info = str(e)
          except py.builtin._sysex:
              raise
          except:
              exc_info = "unknown"
          return '<[%s("%s") raised in repr()] %s object at 0x%x>' % (
              exc_name,
              exc_info,
              x.__class__.__name__,
              id(x),
          )
      else:
          if len(s) > self.maxsize:
              i = max(0, (self.maxsize - 3) // 2)
              j = max(0, self.maxsize - 3 - i)
              s = s[:i] + "..." + s[len(s) - j :]
          return s
  
file_path: catboost/contrib/python/py/py3/py/_io/saferepr.py
imports: import py
  import sys
label_desc: Use image node_id 4 for calling the SafeRepr obj's underlying member method code with example usage: obj._callhelper(call, x) and returns: s, unknown