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Thu Nov 27 20:50:47 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-November/083731.html

Update: it looks like IEEE 754-1985 does require that
roundtripping works, at least when the rounding mode
is round-to-nearest.  From section 5.6 again:

"""
When rounding to nearest, conversion from binary to decimal and back to
binary shall be the identity as long as the decimal string is carried to the
maximum precision specified in Table 2, namely, 9 digits for single and 17
digits for double.
"""

Mark

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Showing content from https://mail.python.org/pipermail/python-dev/2008-November/083731.html below:

[Python-Dev] Python 2.6/3.0, IEEE 754 floating point semantics and S60