On Tue, Mar 1, 2011 at 3:35 AM, Guido van Rossum <guido@python.org> wrote:
It comes up occasionally and is aways rejected on the same grounds as rejecting '1' + 2. I.e., we believe that the current approach catches more bugs.
With the advent of bytes.join, this is even more true than ever:
data = b'1', b'2', b'3', b'4' data (b'1', b'2', b'3', b'4') b''.join(data) # Intended operation b'1234' ''.join(data) # Lack of coercion means a typo gives an immediate error Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: sequence item 0: expected str instance, bytes found ''.join(map(str, data)) # Implicit coercion would convert exception into bad output "b'1'b'2'b'3'b'4'"
Cheers, Nick. -- Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia