On 14/04/15 12:38, Volker Braun wrote:
The behavior of len is just a CPython implementation detail. One that is perfectly fine if you have actual containers but really crappy if you want to do math. Its not like we would break len, it is still in line with the Python docs.
If you want to do math, use `.cardinality()`. Some sets are infinite. Moreover there is a nice difference between `len(S)` and `S.cardinality()` that I like: the former returns a Python int while the second returns a Sage integer or Infinity (almost always, see #18159).
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