[issue4114] struct returns incorrect 4 byte float

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Why do you use float (32 bits) instead of double (64 bits)? Your 
example use:
 double (python) -> float (C) -> double (python)

If you convert 64 bits float to 32 bits, for sure you will loose some 
digits. It's not a bug in Python, but a problem in your code ;-)

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nosy: +haypo

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