Calculate distance between two numbers

num_distance.py

def to_positive(input):
    if (input < 0):
      input = input * -1
    return input

def to_negative(input):
    if (input > 0):
      input = input * -1
    return input

def distance(init_step, end_step):
	if init_step < end_step:
		units = to_positive(init_step - end_step)
	else:
		units = to_negative(end_step - init_step)
	return units

print(distance(-10,10))
print(distance(10,-10))
print(distance(-2,2))
print(distance(2,-2))
print(distance(-2,10))
print(distance(-10,2))
print(distance(-10,-2))
print(distance(2,10))
print(distance(10,2))