Python number mapping, taken from : http://stackoverflow.com/a/1969274

map.py

def mapping(value, leftMin, leftMax, rightMin, rightMax):
	# Figure out how 'wide' each range is
	leftSpan = leftMax - leftMin
	rightSpan = rightMax - rightMin

	# Convert the left range into a 0-1 range (float)
	valueScaled = float(value - leftMin) / float(leftSpan)

	# Convert the 0-1 range into a value in the right range.
	return rightMin + (valueScaled * rightSpan)