Why doesn't Python have a sign function?

Question

I can\'t understand why Python doesn\'t have a sign function. It has an abs builtin (which I consider sign\'s sister), but no si

Answer 1

Another one liner for sign()

sign = lambda x: (1, -1)[x<0]

If you want it to return 0 for x = 0:

sign = lambda x: x and (1, -1)[x<0]