On 06Jun2020 02:40, Chris Angelico <ros...@gmail.com> wrote:
On Sat, Jun 6, 2020 at 2:36 AM Agnese Camellini
<agnese.camell...@gmail.com> wrote:
Hello to everyone, lately i building up an open source project, with some
collaborator, but one of them cannot contribute any more. He is a solution
architect so he is very skilled (much more than me!). I am now analysing
his code to finish the job but i don't get this use of the lambda arrow,
it's like he is deplaring the returned tipe in the function signature (as
you would do in Java). I have never seen something like this in python..
Can someone please explain to me this usage (the part regarding the
question is highlighted in yellow):
@classmethod
def extract_document_data(cls, file_path : str) -> DocumentData:
I don't know what you highlighted in yellow, as that part didn't come
through. But in Python, that arrow has nothing to do with lambda
functions; it is exactly as you describe, annotating a function with
the type of its return value.
The OP may be being confused by JavaScript, where they have "arrow
functions", which are what Python calls lambda: anonymous functions. It
uses an arrow in the syntax:
(x,y) -> x+y
To reiterate what Chris said: in Python the -> is just a type
annotation, indicating the expected return type(s) for a function.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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