Tim Peters added the comment:
Of course pickles come with overheads too - don't be tedious ;-) The point is
that the guts of the datetime pickling is this:
basestate = PyBytes_FromStringAndSize((char *)self->data,
_PyDateTime_DATETIME_DATASIZE);
That consumes exactly 10 bytes today. Add nanoseconds, and it will take at
least 11 (if 4 bits are insanely squashed into the bytes currently devoted to
microseconds), and more likely 12 (if nanoseconds are sanely given their own 2
bytes). I suppose another possibility is to get rid of microseconds
internally, and work with a single 4-byte nanosecond member.
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<http://bugs.python.org/issue15443>
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