title: Python: fast way to compute the average of several (same length) lists?
body: <p>Is there a simple way to calculate the mean of several (same length) lists in Python? Say, I have <code>[[1, 2, 3], [5, 6, 7]]</code>, and want to obtain <code>[3,4,5]</code>. This is to be doing 100000 times, so want it to be fast.</p>