Mike Driscoll a écrit :
On Jun 27, 9:48 am, Evan <[EMAIL PROTECTED]> wrote:
HI,
When I check example of "cmd2" module (a enhancement of cmd module), I
can not understand all, for example: the character "@",
+++++++++++++++++++++++++++++++++++++++++++++++++++++
def options(option_list):
..........<function content>........
class cmd(...):
...............................
@options([make_option('-p', '--piglatin', action="store_true",
help="atinLay")])
+++++++++++++++++++++++++++++++++++++++++++++++++++++
I do not understand what "@options" does, most time, I know what the
meaning of character "*" and character "**", but I was not use "@"
before.
Thanks for your help.
The "@" sign is there to signify that what follows is a decorator.
They're kind of cool and kind of confusing. Basically they dynamically
alter a function, method or class and gives them additional
functionality. It's kind of like calling a function recursively.
Mostly, it's just syntactic sugar for an higher order function. IOW, given:
def deco(func):
# do anythin you wish here
# and return any callable object
return any_callable_object
the two following syntaxes are equivalent:
def toto():
pass
toto = deco(toto)
@deco
def toto():
pass
--
http://mail.python.org/mailman/listinfo/python-list
