On Tue, Mar 5, 2019 at 6:42 PM Jimmy Girardet firstname.lastname@example.org wrote:
Indeed the "obscure" argument should be thrown away.
The `|` operator in sets seems to be evident for every one on this list but I would be curious to know how many people first got a TypeError doing set1 + set2 and then found set1 | set2 in the doc.
Except for math geek the `|` is always something obscure.
In Japan, we learn set in high school, not in university. And I think it's good idea that people using `set` type learn about `set` in math. So I don't think "union" is not only for math geeks.
But we use "A ∪ B" in math. `|` is borrowed from "bitwise OR" in C. And "bitwise" operators are for "geeks".
Although I'm not in favor of adding `+` to set, it will be worth enough to add `+` to set too if it is added to dict for consistency.
FWIW, Scala uses `++` for join all containers. Kotlin uses `+` for join all containers. (ref https://discuss.python.org/t/pep-584-survey-of-other-languages-operator-over...)