from __future__ import division
from __future__ import division
Import the language feature division (exact division) that python will support in the future. When we do not import this feature in the program, the "/" operator performs truncating division (Truncating Division). When we import exact division, "/" executes is exact division, as follows:
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>>> 3/40
>>> from __future__ import division
>>> 3/4
0.75
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After importing exact division, to perform truncating division, you can use the "//" operator:
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>>> 3//4
0
>>>
>>> 3//4
0
>>>