[Python] Changing values in list: Python

I'm making a function to modify the elements in a list, but it doesn't change all the way through... My function is:

def modifyValues(l):
for x in l:
if x == 1:
l[x] = 'a'
elif x == 2:
l[x] = 'b'
elif x == 3:
l[x] = 'c'
print (l)


when

modifyValues([1, 2, 3, 2, 3, 1, 2, 2])


the output is:

['a', 'b', 'c', 2, 3, 1, 2, 2]


Why doesn't it change every value?

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