Does the walrus operator work for functions(methods) too?

Question

In Python all is object. So if wo:= 3 or wo:=str.center should not matter.
but I dont get it. I cant create a program for it.
yeah there are lambdas, but I WANT WALRUS.

EDIT: I wanted center(20) as walrus .... see prog
https://code.sololearn.com/c2hdaPD1J8iC/?ref=app

Answer 1

I think you are looking for something like this. You can bind a lambda which will center a piece of text, to a variable with walrus, then reuse the same lambda later.

print((y := lambda t: t.center(20))("hello"), y("world"), sep="\n")

Answer 2

Denise Roßberg tbh: I wanted center(50) as a walrus...
i dont want to define before but inline
.... Now I can say clearly what the problem is.

Answer 3

Hi Oma Falk

Do you mean something like this?

def fun():
print('test')

(walrus:=fun)
walrus()

Answer 4

independent of the walrus operator: if you only store the method center, I wonder how a string should access it.

x = str.center
And now? "abc".x(20) will not work, because str does not know x.

Answer 5

If you do...

x := str.center

... you are storing the type's original method.

Using that, you would have to pass 'self' by hand, because x is not an instance method.

So you'd have to use...

x('your string', 42)

... instead of just ...

x(42)

I can imagine hacks like this one, just to illustrate:

print((x := str.center)('hello', 9), x('world', 9))

Alternatively, you can store the instance method as well, but then you can only call it for that specific str object.

print([x:='Hello'.center, x(7)][1], x(9), x(11), sep='\n')

Here, first the string 'Hello' is created, its method center bound to the name x, and then the method is called several times for the object it belongs to.

Answer 6

works also:
st = "test"
(wo:=st.center(50))
print(wo)

Unfortunately I forgot where I have read that walrus operator needs brackets.
Normally you use it inside an expression, maybe it has something to do with that.

Answer 7

(w:=lambda x,y:x.center(y))
do you mean something similar to this?
or like
(p:=print)