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For the ``future`` package.
Adds this import line:
from __future__ import division
at the top and changes any old-style divisions to be calls to
past.utils.old_div so the code runs as before on Py2.6/2.7 and has the same
behaviour on Py3.
If "from __future__ import division" is already in effect, this fixer does
nothing.
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__future__.division redefines the meaning of a single slash for division,
so we match that and only that.
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Skip this fixer if "__future__.division" is already imported.
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Since the tree needs to be fixed once and only once if and only if it
matches, we can start discarding matches after the first.
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