python loop and plot

import numpy as np
import matplotlib.pyplot as plt
import time
muarr = np.linspace(0,10,10)
print('muarray')
print(muarr)
 
z = np.linspace(0.0,1.0,10)  # create an array
print('array z')
print(z)

def fillit(mu):
    x = 10  # initial x value
    for i in range(0,10):   # fill n2-n1 iterations
        z[i] = i * x * mu
    return z  # returning the array

for i in range(0,10):  
        mu = muarr[i]          #for a specific horizontal axis location
        print()
        print('iteration '+ str(i))
        print('muarray '+str(i))
        print('mu = '+str(mu))
        y=fillit(mu)  # an array of 10 elements from 0 to 100*mu
        print('array y is an array of 10 elements from 0 to 100*mu')
        print (y)
        x=y*0.0 + mu   # dummy x value is all mu 
        print('array x is just all mu so that each x,y pt can be plotted')
        print (x)
        plt.plot(x,y,'ko',markersize=1)   # k=black, plot small points