max number of matrix to python

I'm new to matlab and need to convert this line to python code

n=max(xx(:,2));

what i got that it's calculated the max number from a matrix and store this value in varable n

but i couldn't got what does that mean xx(:,2)?

Answer 1

[Image Analyst]

It takes column 2 of the matrix xx and gets the max value in that column 2 and sticks it in the variable called n (yeah - bad name, I know).