[Python] Can't eliminate floating point errors with Decimal

I'm using Decimal everywhere to try and get rid of floating point errors, but it's persisting.

Here's my test code

from decimal import Decimal
Demands = [9,12,8,11]


fM = Decimal(10)

alpha = Decimal(.01)

fM = Decimal((1 - Decimal(alpha)) * fM + Decimal(alpha) * Demands[(1) % 4])

print(fM)


But the output is still

10.02000000000000000041633363

Continue reading...