On 2018 Jun 12 , at 10:54 a, Mikhail V <mikhailwas@gmail.com> wrote:
I think it would be logical to have the insert operator for lists. Similar to list extend operator += , it could use one of augmented assignment operators, e,g, /=.
L = ["aa"]
L[0] /= "bb"
-> ["bb", "aa"]
L[0] /= [1,2]
-> [[1,2], "aa"]
-1. There's not much about this that is logical, no matter how much you want an insertion operator. Even if L[0] /= "bb" worked, then logically so should L[0] = L[0] / "bb". However, there is no sense in which L[0] / "bb" by itself has any meaning, and what would L[1] = L[0] / "bb" mean? And finally, L[0] /= x (and really, every other augmented operator) *already has* a meaning:
L = [10] L[0] /= 2 L [5]
Note that there is a trick to 'insert' an element with slicing syntax, e.g.:
L[0:0] = [[1,2]]
-> [[1,2], "aa"]
L[0:0] = ["bb"]
-> ["bb", "aa"]
The trick is to put brackets around the element and so it works as insert(). Though additional brackets look really confusing for this purpose, so I don't feel like using this seriously.
It's no more confusing than co-opting an unrelated operator to do the same thing. -- Clint