how to scale factors

scale.py

def featureScaling(arr):
    _max = 0
    _min = 10000000
    for a in arr:
        if a < _min:
            _min = a
        if a > _max:
            _max = a
            
    scaled = []
    for a in arr:
        scaled.append((a - _min) / float((_max - _min)))

    return scaled

data = [115, 140, 175]
print featureScaling(data)