On 7 mai, 23:38, globalrev <[EMAIL PROTECTED]> wrote:
> i have a rough understanding of lambda but so far only have found use
> for it once(in tkinter when passing lambda as an argument i could
> circumvent some tricky stuff).
> what is the point of the following function?
>
> def addn(n):
> return lambda x,inc=n: x+inc
It returns a function that accept one argument and return the result
of the addition of this argument with the argument passed to addn.
FWIW, Python's lambda is just a shortcut to create a very simple
function, and the above code is canonically written as:
def makeadder(n):
def adder(x):
return n + x
return adder
> if i do addn(5) it returns
>
(snip)
> <function <lambda> at 0x01D81830>
>
> ok? so what do i write to make it actually do something.
add5 = addn(5)
add5(1)
=> 6
add5(2)
=> 7
add42 = addn(42)
add42(1)
=> 43
> and is the
> inc=n necessary i cant do x+n?
In this case, it's not. This version does exactly the same thing
AFAICT:
def addn(n):
return lambda x: x+n
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