i saw this post over at cgtalk and was surprised to find the answer so
elusive: http://forums.cgsociety.org/showthread.php?f=89&t=772302

here's the post:
---------------------------------------
I am trying to convert this mel code to python but I can't get the
time attribute working properly.
mel:

   keyframe -time "50:" -relative -timeChange 1 -option over;


I tried this python equivalent:

    cmds.keyframe(time=(50:), relative=1, timeChange=1,
option="over")
    # TypeError: Invalid arguments for flag 'time'. Expected (time,
[time]), got int #


I also tried with quotes, without quotes, with a comma, without a
comma, etc. The only time i get the python equivalent working is if i
set a timeRange to time=(startInt,endInt) i would like to specify time=
(startInt, *onward*)


--------end---------

i was very surprised to find that neither of these worked:

cmds.keyframe(time=(50,), relative=1, timeChange=1, option="over")
cmds.keyframe(time=(50,None), relative=1, timeChange=1, option="over")

i tested this in 2009

-chad


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