Jim Fulton wrote: > > "M.-A. Lemburg" wrote: > > > > Jim Fulton wrote: > ... > > > > What is data roundtrip safety? > > > > Roundtrip safety means that e.g. if you take a COM date value > > from a ADO and create a DateTime object with it, you can > > be sure to get back the exact same value via the COMDate() > > method. > > Since I don't know what COMDate is, this doesn't mean > anything to me. :) Then you're lucky -- COMDates are just about the strangest beast I've ever seen as date/time encoding. > ... > > I suppose that I could easily make a few calculation > > lazy to enhance speed; memory footprint would not change > > though. It's currently at 56 bytes per DateTime object > > and 36 bytes per DateTimeDelta object. > > Does that include the two words of Python object overhead? I suppose so -- the values I quoted are the tp_size values of the types. The instance will probably also require a dictionary and the weak ref list on top of those figures. > > To get similar accuracy in Python, > > I assume you mean precision. Eh, yes. > > you'd need a float and > > an integer per object, > > It depends on the desired precision. To get minute > precision, an int will do. Two ints can get you about > a hundreth of a microsecond precision, which is more than > most people need. I was just trying to compare apples to apples :-) mxDateTime offers the same precision as a float (for daytime) and an integer (for the day) can give. > > that's 16 bytes + 12 bytes == 28 bytes > > + malloc() overhead for the two and the wrapping instance > > which gives another 32 bytes (provided you store the two > > objects in slots)... >60 bytes per Python based date time > > object. > > A Python-based date-time object isn't very interesting to me. You should have mentioned that earlier ;-) -- Marc-Andre Lemburg CEO eGenix.com Software GmbH ______________________________________________________________________ Company & Consulting: http://www.egenix.com/ Python Software: http://www.egenix.com/files/python/
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