More Scala-like lambda expression

[MagicalLas]

[MagicalLas]

def add(x, y):
    return x + y

f = str(_ + 3)
assert f(2) == "5"

f = add(_, 3)
assert f(2) == 5

f = add(x=_, y=3)
assert f(2) == 5

f = add(_, y=3)
assert f(2) == 5