Python package to estimate Perron-Frobenius Eigenvalue of real, square, non-negative matrix

Is there an optimized package or method that estimates the Perron-Frobenius eigenvalue of a real, square, non-negative matrix? This could be significantly faster (especially for large and/or sparse matrices) than an exact calculation -- given that the Perron-Frobenius eigenvalue can be arrived at by iterating the matrix. I am hoping an optimized package exists which does this.