Brett Cannon added the comment:

This is actually expected because that is just how floating point works in 
programming (see http://en.wikipedia.org/wiki/Floating_point for all the gnarly 
details).

If you want exact decimal arithmetic, use the decimal module (which got 
significantly faster in Python 3.3)::

>>> import decimal
>>> decimal.Decimal('.3') - decimal.Decimal('.1')
Decimal('0.2')
>>> decimal.Decimal('.05') + decimal.Decimal('.01')
Decimal('0.06')

----------
nosy: +brett.cannon
resolution:  -> invalid
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18613>
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