Lambda should have the same syntax as ordinary functions. The only
difference should be: you don't have to put the name of the function.

def f (x, y): return x ** 2 + y ** 2

g = f

h = def (x, y): return x ** 2 + y ** 2

Functions f, g and h are doing the same.

Javascript handles anonymous functions this way as well:

function f(x, y) { return x*x + y*y; }

g = f;

h = function(x, y) { return x*x + y*y; }