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

You dont need one, you can just use:

if not number == 0:
    sig = number/abs(number)
else:
    sig = 0

Or create a function as described by others:

sign = lambda x: bool(x > 0) - bool(x < 0)

def sign(x):
    return bool(x > 0) - bool(x < 0)