How to use 'python list difference between elements' in Python

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69def set_difference_update(arr, *others):
70 pass
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20def sorted_list_difference(expected, actual):
21 i = j = 0
22 missing = []
23 unexpected = []
24 while True:
25 try:
26 e = expected[i]
27 a = actual[j]
28 if e < a:
29 missing.append(e)
30 i += 1
31 while expected[i] == e:
32 i += 1
33
34 elif e > a:
35 unexpected.append(a)
36 j += 1
37 while actual[j] == a:
38 j += 1
39
40 else:
41 i += 1
42 try:
43 while expected[i] == e:
44 i += 1
45
46 finally:
47 j += 1
48 while actual[j] == a:
49 j += 1
50
51 except IndexError:
52 missing.extend(expected[i:])
53 unexpected.extend(actual[j:])
54 break
55
56 return (missing, unexpected)

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