On 11/4/2012 7:45 AM, Dave Angel wrote:
What I wonder about is why list's __add__ is so fussy.
Guido's reason is that it is not clear what the types of [1,2] + (3,4), (1,2) + [3,4], [] + range(4), range(2) + [3,4], etcetera should be. Such mixtures may be bugs. Seq.__add__ exists to implement '+'.
[].extend() will clearly be a list, and accepts any iterable. I believe the same logic is used for set operations. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
