[issue4114] struct returns incorrect 4 byte float

[TD22057]

TD22057 <ted.drain at jpl.nasa.gov> added the comment:

Martin is correct.  I expected (naively) that struct would zero pad the
digits beyond the significant digits of a float.  As to whether it's
exact or not, see my first message:
>>> v=1.8183e-7
>>> v
1.8183000000000001e-07

Since 32 bit floats only have ~7 digits of precision, I expected to get
the same thing back.  Not 7 digits + garbage.

Like I said, you can mark this bug as invalid since Python is just
reflecting what C is doing.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4114>
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