Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
> * It is natural to expect the plus operator to be commutative, but this > operation would necessarily be non-commutative. In Python, the plus operator for sequences (strings, lists, tuples) is non-commutative. But I have other arguments against it: * It conflicts with the plus operator of Counter (which is a specialized dict): Counter(a=2) + Counter(a=3) == Counter(a=5), but the proposed idea makes dict(a=2) + dict(a=3) == dict(a=3). * We already have a syntax for dict merging: {**d1, **d2}. It works with arbitrary mappings, in contrary to the plus operator, which needs a special support in argument types. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36144> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com