animCurve, key values and time

import maya.cmds as mc;

## Querying

# Current time

crntT = mc.currentTime(q=1);

# Getting anim nodes of current key selection

animNodesOfSelectedKeys = mc.keyframe(q=1,sl=1,n=1);

offsetval= 12.34;

if animNodesOfSelectedKeys:

    for aNode in animNodesOfSelectedKeys:

        # Current time value of selected key curve

        keyCurveValue = mc.keyframe(aNode,q=1,ev=1,t=(crntT,crntT))[0];

        # Num of keys of an animCurve node

        numKeys = mc.keyframe(animCurveNode,q=1,keyframeCount=1);

        # All key "TIMES"

        times = mc.keyframe(animCurveNode,index=(0,numKeys-1),q=1);

        # All key time "VALUES"

        vals = mc.keyframe(animCurveNode,t=(times[0],times[len(times)-1]),q=1,valueChange=1);

        ## Changing key times and values

        ## Add offset values

        ## One at a time

        for i in range(0,numKeys):

            currentVal = mc.keyframe(aNode,t=(times[0],times[numK-1]),q=1,valueChange=1);

            mc.keyframe(animCurveNode,edit=1,index=(i,i),valueChange=currentVal+currentVal);