nor.py

>>> def normalize(vector):
...     normalized = []
...     for elem in vector:
...         normalized.append(elem / 255.)
...     return normalized
... 
>>> normalize((1,2,3))
[0.00392156862745098, 0.00784313725490196, 0.011764705882352941]
>>> normalize((0, 0, 0))
[0.0, 0.0, 0.0]
>>> normalize((255,255,255))
[1.0, 1.0, 1.0]
>>> normalize((128,128,128))
[0.5019607843137255, 0.5019607843137255, 0.5019607843137255]
>>> normalize((128,128,127))
[0.5019607843137255, 0.5019607843137255, 0.4980392156862745]
>>>