[Python] how to find the dimension of a CSR matrix in Python

I have a tfidf matrix of type scipy.sparse.csr.csr_matrix

How do I find the number of rows and number of columns of it in Python 3?

I tried converting it to a dense one and then finding the length of a row like this

len(tfidf_matrix.todense()) but it outputs 1 which is not right.

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