Getting jaccard similarity from co-ocurrence matrix

I have a co-occurence matrix in python for co-ocurrences of certain keywords A,B,C

    A   B   C
A   5   1   0
B   1   3   2
C   0   2   3

How can I calculate the jaccard similarity from this matrix in Python for all keywords. Is there any library available to do that or should I simply compute the similarity by using the Jaccard similarity formula?

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