Johny wrote:
Hi,
Can anyone explain to me what are decorators for? What are advantages
of using them?
There are two questions: why wrap or modify a function after it is
modified? (others have answered this), and why the special syntax?
As to the second:
@deco
def f(): pass
is syntactic sugar for
def f(): pass
f = deco(f)
with two advantages. The 'sugar' informs the reader immediately that
the function will be wrapped or modified, which could be missed if the
body is long, and eliminates two repetitions of the function name, which
could be a long_info_rich_coded_name such as required in some projects.
A subtle effect of having the special syntax is that it has directed
more attention to the idea of post-processing functions and now, in 3.0,
classes.
Terry Jan Reedy
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