unsupported operandtype(s) for -: 'list' and 'int'

[Lakkad]

Here is the basic code.

for a in range(1, 5):
for b in range(0+[a*2]-2],2*a)
print(b)

It shows error unsupported operandtype(s) for -: 'list' and 'int'

I have tried everything, it seems that in the range of second for loop 'a' which is 'int'type becomes 'list'

Please help