python sagemath programming

Problem 6: Linear algebra over Q Grading criteria: correctness of code and thoroughness of explanation. 6a. Explain in detail what the following code does and how it is being done. Assume that the input M is a matrix with entries in 00. def (): In t M = copy (M) # replace M with a copy to avoid clobbering the original n-M.dimensionst0 if n -M.dinensions)[1: raise ValueError for i in range(n) while j<>