On 11/27/2018 5:48 AM, Ivo Shipkaliev wrote:
Hello.
Maybe it's too late for a discussion, but I just couldn't resist.
I just found out about this new ":=" operator. I need to ask:
What is the need for this additional ":" to the "="?
Did you read the PEP? It answers the question.
Why:
if (match := pattern.search(data)) is not None:
# Do something with match
What is wrong with:
if match = pattern.search(data) is not None:
# Do something with match
match = pattern.search(data) is not None
returns True or False, which is then assigned to match. On the other
hand, in
(match := pattern.search(data)) is not None
match is assigned the result of the search; then that is compared to None.
I am glad to see this added to python. I first encountered embedded assignment
in 1969 in the fortran iv compiler for the GE 415 computer. Love at first sight.
--
Bob Gailer
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