Python 3.5.1 (v3.5.137a07cee5969, Dec  6 2015, 013848) [MSC v.1900 32 bit (Intel)] on win32
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 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1
0.8999999999999999
 print(0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1)
0.8999999999999999