Angle between 2 vectors using MEL in Python

# Node positions

pos0= cmds.xform(node0, q=1, ws=1, t=1);

pos1= cmds.xform(node1, q=1, ws=1, t=1);

pos2= cmds.xform(node2, q=1, ws=1, t=1);

# 2 Vectors. pos0-pos1 and pos0-pos2.

import maya.api.OpenMaya as om;

vec0= om.MVector(pos0);

vec1= om.MVector(pos1);

vec2= om.MVector(pos2);

vecA= vec0-vec1;

vecB= vec0-vec2;

# Radian and degree

import maya.mel as mm;

melVecFormatStrA= "<<"+str(vecA[0])+","+str(vecA[1])+","+str(vecA[2])+">>";

melVecFormatStrB= "<<"+str(vecB[0])+","+str(vecB[1])+","+str(vecB[2])+">>";

rad= mm.eval("angle "+melVecFormatStrA+" "+melVecFormatStrB);

deg= mm.eval("rad_to_deg("+str(rad)+")");

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