[MAYA] from a set of cameras generate an animated camera

animateCamera.py

import maya.cmds as cmds

# Retrieve selected cameras
selectedCameras = cmds.ls(sl=True, dagObjects=True, cameras=True)
# Set key frames on selection
cmds.setKeyframe()

# Create render camera
cameraName = cmds.camera()
cameraName = cmds.rename(cameraName[0], "render")

i = 1
for cam in selectedCameras:
    print i 
    relatives = cmds.listRelatives(cam, parent=True)
    print relatives[0]
    cmds.copyKey(relatives[0])
    cmds.pasteKey(cameraName, time=(i,i))
    i += 1