check if element is in a list in a dictionary value

[deanhystad]

import itertools

x = {
    2:[2, 4, 6, 8],
    3:[3, 6, 9, 12],
    5:[5, 10, 15, 20]
}

values = set(itertools.chain(*x.values()))  # Get set containing all values from dictionary
for i in range(10):
    print(i, i in values)

Output:
0 False
1 False
2 True
3 True
4 True
5 True
6 True
7 False
8 True
9 True