Perlin Noise Test Python

perlin.py

from matplotlib import pyplot

X=[]
Y=[]

currentNum = 0
randRange = 7

def getPerlinNum():
    global currentNum, randRange
    currentNum = random.randrange(currentNum-randRange+1,currentNum+randRange)
    return currentNum

def getRandomNum():
    return random.randrange(-50,50)

for i in range(0,100):
    X.append(i)
    Y.append(getPerlinNum())
    #Y.append(getRandomNum())
 
pyplot.plot( X, Y, '-' )
pyplot.title( 'Plotting PERLIN' )
pyplot.xlabel( 'X' )
pyplot.ylabel( 'Y' )
pyplot.show(block=False)