Random walk in python

I am trying to implement a random walk in python. This is the error I get. I feel my implementation is wrong or at least not the best. Can someone have a look at it. Keep in mind I am a beginner in python and this is how I think someone would code something, so I can be totally off.

in randomWalk(stepSize, stepNumber)
     37     for _ in range(stepNumber):
     38         r = randint(1,4)
---> 39         x,y = movement[r]
     40         xList.append(x)
     41         yList.append(y)

TypeError: 'function' object is not iterable

This is my code

from pylab import *
import numpy as np
import matplotlib.pyplot as plt
import random as rnd
matplotlib.rcParams.update({'font.size': 20})

x = 0.
y = 0.
xList = []
yList = []
def goRight(stepSize, y):
    direction = np.cos(0)
    x = stepSize*direction
    return [x,y]

def goUp(stepSize, x):
    direction = np.cos(90)
    y = stepSize*direction
    return [x,y]

def goLeft(stepSize, y):
    direction = np.cos(180)
    x = stepSize*direction
    return [x,y]

def goDown(stepSize, x):
    direction = np.cos(270)
    y = stepSize*direction
    return [x,y]

def randomWalk(stepSize, stepNumber):
    movement = {1: goRight, 
                2: goUp, 
                3: goLeft, 
                4: goDown}

    for _ in range(stepNumber):
        r = randint(1,4)
        x,y = movement[r]
        xList.append(x)
        yList.append(y)


    plt.ioff()
    plot(x, y)
    plt.show()


randomWalk(1.,4)