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Is there a way to move a keyframe using Python (change the frame at which the keyframe is set)?

The keyframe already exists. I need to access it and move it, with the script.

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This is not hard:

bpy.data.actions[aname].fcurves[i].keyframe_points[j].co[0] = fr1

The tricky part is picking the right fcurve[i] and keyframe_points[j] if there are more than one. You'll have to check fcurve[i].data_path and (if it's a vector data_path like location or rotation*) fcurve[i].array_index to make sure you're altering the right fcurve.

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    $\begingroup$ You can also access co[0] and co[1] like co.x (frame) and co.y (value). The action associated with an object is accessible via Object.animation_data.action. Note that both animation_data and action can be None. $\endgroup$ – CodeManX Jan 28 '15 at 17:34

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