misclassification rate calculation for multi class label

[python_newbie09]

I have a confusion matrix with 4 labels and the results were as below

[[ 81 4 41 0]
[ 10 10 6 1]
[ 7 0 392 0]
[ 4 2 8 5]]

Now i wish to calculate the misclassification rate but I am not sure how to do this in Python. Would appreciate your help to show me how to code this part.

Thank you.