Loop does not work in python

[Ola92]

It seems that I misunderstood the step : Assignment step: Assign each measurement to the cluster with the closest mean value. In case of a tie,assign the measurement to cluster 1 in the assigment. I changed my code now but it does not give me any output right now...
My code:

import numpy as np
import math
def clusterAnalysis(reflectance):
    ref=np.size(reflectance)# all N measurements
    even=np.any(ref %2==0)# N measurements are even numbers
    uneven=np.any(ref%2>0)# N measurements are odd number
    mean1=np.mean(even)#average of even numbers in cluster 2
    mean2=np.mean(uneven)# average of odd numbers in cluster 1
    sub1=abs(ref-mean1)
    sub2=abs(ref-mean2)
    while sub1<=sub2:
        clusterAssigment="1"
    else:
        clusterAssigment="2"
    return clusterAssigments
print(clusterAnalysis(np.array([1.7, 1.6, 1.3, 1.3, 2.8, 1.4,
2.8, 2.6, 1.6, 2.7])))

Can anybody help me please? I am struggling very much with this assigment....