function expression with 2 arguments

[Xah Lee]

is there a way to write a expression of a function with more than 1
argument?

e.g., i want a expression that's equivalent to

def f(x,y)
return x+y

Xah
(e-mail address removed)
http://xahlee.org/PageTwo_dir/more.html

 

[Harlin Seritt]

Not exactly sure what you're looking for but you can do the following:

def dosomething(numlist):
return numlist[0] + numlist[1]

numlist = [ 5, 10]
val = dosomething(numlist)

If so, that would be somewhat pointless. It's always best to keep it
simple. It looks like the function you wrote above is very adequate for
the results you want returned.

 

[Reinhold Birkenfeld]

is there a way to write a expression of a function with more than 1
argument?

e.g., i want a expression that's equivalent to

def f(x,y)
return x+y

Looking for lambda?

Reinhold

 

[Peter Hansen]

is there a way to write a expression of a function with more than 1
argument?

e.g., i want a expression that's equivalent to

def f(x,y)
return x+y

Since assignment is a statement in Python, not an expression,
and since "def f" is an assignment that binds a function
object to the name "f", you can't do exactly what you've
asked for.

On the other hand, this should be about equivalent, though
it's not merely an expression:

f = lambda x, y: x + y

 

[Xah Lee]

lambda x, y: x + y

that's what i was looking for.

.... once i have a lambda expr, how to apply it to arguments?

e.g. in Mathematica
Function[#1+#2][a,b]

Python doc is quite confounded in it's way of organization centered
around implementation tied to hardware (as most imperative languages
are hardware-centric), as opposed to algorithm math concepts.

Xah
(e-mail address removed)
http://xahlee.org/PageTwo_dir/more.html

 

[Leif K-Brooks]

lambda x, y: x + y

that's what i was looking for.

... once i have a lambda expr, how to apply it to arguments?

http://python.org/doc/current/ref/calls.html

 

[Nick Coghlan]

Python doc is quite confounded in it's way of organization centered
around implementation tied to hardware (as most imperative languages
are hardware-centric), as opposed to algorithm math concepts.

Actually, Python's docs are centred around the fact that they expect people to
start out by at least skimming the freaking tutorial. . .

Cheers,
Nick.

 

[Harlin Seritt]

?

 

[Xah Lee]

once i have a expresson of a function, how to apply it to arguments?

e.g. if i have
lambda x,y:x+y
i have to applied it to a,b in my code.

Xah
(e-mail address removed)
http://xahlee.org/PageTwo_dir/more.html

 

[Roel Schroeven]

once i have a expresson of a function, how to apply it to arguments?

e.g. if i have
lambda x,y:x+y
i have to applied it to a,b in my code.

OK, I'll bite.

As with any other callable, you can simply call it like this:

a = 4
b = 24
(lambda x, y: x+y)(a, b)

Of course, you could just as well simply write

a+b

instead.

Most often the lambda is not used directly, but passed to a function. A
trivial example:

def f(fn, a, b):
return fn(a, b)

f(lambda x, y: x+y, 3, 42)

 

[Xah Lee]

(lambda x, y: x+y)(a, b)

Thanks. That's what i was looking for.

where in Pytho doc can one find this? or the lambda with multiple
params?

Most often the lambda is not used directly, but passed to a function.

That is because the IT morons has been throughly brainwashed by
imperative shits. (and these morons don't even know it)

i'll explain the ins and outs of expressions of functions some other
day.

Xah
(e-mail address removed)
http://xahlee.org/PageTwo_dir/more.html

 

[Peter Hansen]

Thanks. That's what i was looking for.

where in Pytho doc can one find this? or the lambda with multiple
params?


That is because the IT morons has been throughly brainwashed by
imperative shits. (and these morons don't even know it)

i'll explain the ins and outs of expressions of functions some other
day.

After you read about them, I guess? We look forward to your
profound words on the subject.

Sheesh...

 

[Xah Lee]

PS sorry for the rude remarks out of nowhere.

Xah

 

[Steve Holden]

PS sorry for the rude remarks out of nowhere.

Xah

Wow, signs of developing inter-personal skills. I must assume that
c.l.py is having its benign influence on you too!

regards
Steve

 

[Xah Lee]

if i understand correctly, forms such as
(lambda x,y:x+y)(a,b)
can only be gained thru experience? and not documented directly
anywhere in the official docs?

Xah
(e-mail address removed)
http://xahlee.org/PageTwo_dir/more.html

 

[Leif K-Brooks]

if i understand correctly, forms such as
(lambda x,y:x+y)(a,b)
can only be gained thru experience? and not documented directly
anywhere in the official docs?

The official documentation can't list every possible permutation of the
various syntactic constructs. It does explain parenthesis, the lambda
expression, and calling syntax; the particular combination of the three
that you're using can therefor be logically understood from the docs.

 

[Simon Percivall]

Actually, lambda forms are quite precisely documented at
http://docs.python.org/ref/lambdas.html if you feel than reading
the tutorial (specifically http://docs.python.org/tut/node6.html
section 4.7.5) is too base for you.