Function decorators

[Aigars Aigars]

Good day all,

I am learning Python and came up to decorators.

Thequestion is: Why does function FoodList return value None?

The code in attachment.
Thank you,
Aigars

[David C. Ullrich]

Re: Function decorators

In article <mailman.493.12 20542975.3487.p ython-list@python.org >,
Aigars Aigars <srad@inbox.lvw rote:

Good day all,

I am learning Python and came up to decorators.

The question

is: Why does function FoodList return value None?

Because the function doesn't return anything, and in Python
a function that doesn't explicitly return anything returns None.

>

The code in attachment.


Thanks for not just pasting it into the post, like so:

class Logger:

def __init__(self, function):

self.func = function



def __call__(self, *args, **kwargs):

print "Function %s called with args = %s, kwargs = %s" %
(self.func.__na me__, str(args), str(kwargs))

self.func(*args , **kwargs)



@Logger

def FoodList(a, b, c="spam"):

text = "Food is %s, %s, %s" % (a, b, c)

print text

return text





if __name__ == "__main__":

a = FoodList("eggs" , "potatoes")

print a

Thank you,

Aigars---------------------------------------------------------------------
[Image]

--
David C. Ullrich

[Diez B. Roggisch]

Re: Function decorators

Aigars Aigars schrieb:

Good day all,
>
I am learning Python and came up to decorators.
>
The question is: Why does function FoodList return value None?
>
The code in attachment.

Because the __call__ in Logger doesn't return the value of self.func.

Diez