There's an import statement that will print it I believe, but I'm not sure exactly what it is.
numbers.filter( _ % 2 == 0 )
numbers.filter( _ % 2 == 0 ).map( _ / 2 )
How do you write:
lambda x, y=1: x+y
lambda *args: reduce(lcm, args)
lambda **kwargs: kwargs.get('a') or kwargs.get('b')
def lcm(a, b):
return a*b // gcd(a, b)
def gcd(a, b):
while b:
a, b = b, a % b
return aIt does indeed mention a lambda in the very first example, if only as a competition with list comprehension syntax. But even Python's list comprehensions look a little dated now.
What do you mean by dated? What new ideas have come up for List comprehension syntax?
(I agree that Lambda should be call fun or fn or \. An implicit _ might also work, though that's somewhat against Python's spirit---c.f. the explicit self in methods.)
The part that bothers me about the list comprehension section is that conflating list comprehension and lambda. Is it telling me that list comprehension is better than map/filter or better than lambda? I don't know. Quiet honestly, in many situations I find:
halves_evens = lambda nums : [i/2 for i in nums if nums % 2 == 0]
to be the cleanest.