Creating a matrix with all ones:\\
{\ex \lstinline|    o = ones_like(l)|}

Creating the A matrix:\\
{\ex \lstinline|    A = array(l, ones_like(l)).T|}

Computing least square:\\
{\ex \lstinline|    result = lstsq(A, tsq)|}

Obtaining the m and c values:\\
{\ex \lstinline|    m, c = result[0]|}

Computing the least square fit line:\\
{\ex \lstinline|    lst_line = m * l + c|}