Tim Peters added the comment:
@Liam, try using the "decimal" module instead. That follows rules much like
the ones people learn as kids.
>>> from decimal import Decimal as D
>>> D("0.1") * 3 # decimal results are computed exactly
Decimal('0.3')
>>> D("1.01") - D(".01") # number of significant digits is preserved
Decimal('1.00')
Etc.
----------
nosy: +tim.peters
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<http://bugs.python.org/issue20095>
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