Collapse repeated lines in tracebacks

[Andykl]

Most likely it is broken recursion, but also it is about exception where was script call recursion.
Python 3 do such traceback for recursive call

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in f
  File "<stdin>", line 1, in f
  File "<stdin>", line 1, in f
  [Previous line repeated 996 more times]