Valentine Sinitsyn added the comment:
Seems like mentioning string was really a bad idea. They were only used as
(poor) example, forget them if they are confusing in any way.
In my understanding, any sequence in Python is iterable, bit not all iterables
are sequences (correct me if I'm wrong
New submission from Valentine Sinitsyn:
sum() function doctstring describes expected arguments as follows (Python
2.7.6):
sum(...)
sum(sequence[, start]) - value
...
This implies sum() should accept str, unicode, list, tuple, bytearray, buffer,
and xrange. However, you clearly can't use
Valentine Sinitsyn added the comment:
Yes, strings aren't an issue. I only used them as an example.
I came across this issue during code review, discussing if it is okay to pass
generator expression to sum() (like sum(x*2 for x in xrange(5)) or is it better
to convert it to the list first
