Yan Mitrofanov added the comment:
I got your point. So it seems that two pieces of documentation are not
equivalent:
https://docs.python.org/3/howto/sorting.html#odd-and-ends
> The sort routines are guaranteed to use __lt__() when making comparisons
> between two objects.
New submission from Yan Mitrofanov :
Sorting documentation claims that sorting algorithm is only using < comparisons
https://docs.python.org/3/howto/sorting.html#odd-and-ends
https://docs.python.org/3/library/stdtypes.html#list.sort
When __lt__ implementation is missing, you get an except
