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Hi, the code above seems fine, the output of the show function was a pdf file containing -3. Maybe just

g[f[g[0]]]

If you want the result printed then

print g[f[g[0]]]

Hi, the code above seems fine, the output of the show function was a pdf file containing -3. Maybe just

f = {-3:4, -2:2, -1:0, 0:1, 1:3, 2:4, 3:-1}
g = {-3:-2, -2:0, -1:-4, 0:0, 1:-3, 2:1, 3:2}
g[f[g[0]]]

If you want the result printed then

f = {-3:4, -2:2, -1:0, 0:1, 1:3, 2:4, 3:-1}
g = {-3:-2, -2:0, -1:-4, 0:0, 1:-3, 2:1, 3:2}
print g[f[g[0]]]