https://docs.python.org/3.5/library/traceback.html#traceback-examples
See second code sample and its sample output. According to the docs, the call:

  print(repr(traceback.extract_tb(exc_traceback)))

is supposed to print something that looks like an array with only strings; that is what the doc sample output states:

  [('<doctest...>', 10, '<module>', 'lumberjack()'),

But actually, in 3.5+, this call outputs the repr() of a list of FrameSummary instances that do not go further in repr()esenting their state:

  [<FrameSummary file <ipython-input-61-3e63d7daea82>, line 10 in <module>>,

By looking at the docs I thought I was able to get a nice string representation of a FrameSummary. I actually have to format it myself. It should be reflected in the doc sample output.