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I use:

knn.save('knn.yml')

to save the model

And:

fs = cv2.FileStorage('knn.yml', cv2.FILE_STORAGE_READ)
knn_yml = fs.getNode('opencv_ml_knn')

knn_format    = knn_yml.getNode('format').real()
is_classifier = knn_yml.getNode('is_classifier').real()
default_k     = knn_yml.getNode('default_k').real()
samples       = knn_yml.getNode('samples').mat()
responses     = knn_yml.getNode('responses').mat()
fs.release
knn.train(samples,cv2.ml.ROW_SAMPLE,responses)

to recover it. I hope be of some help