Raymond Hettinger <[email protected]> added the comment:
FYI, there is already a lossless implementation in the docs:
def float_to_decimal(f):
"Convert a floating point number to a Decimal with no loss of
information"
n, d = f.as_integer_ratio()
with localcontext() as ctx:
ctx.traps[Inexact] = True
while True:
try:
return Decimal(n) / Decimal(d)
except Inexact:
ctx.prec += 1
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<http://bugs.python.org/issue4796>
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