Matrix calculator. (Python)

Contains: Addition + size check Subtraction + size check Multiplication + size check

Plan: Approximation of given points in plane by polynom of second degree. (Least squares method) Input from stdin.

Usage: The program opens file given as script argument and does operation (+, -, *) given as second argument.

Input file format: #file has to be in folowing format for correct function

rows columns 			#first matrix
value value value ... value 		#first row with n values
...						#m - 1 rows
value value value ... value			#m th row with n values
rows columns			#second matrix
value value value ... value 		#first row with n values
...						#m - 1 rows
value value value ... value			#m th row with n values

Pylint score: Your code has been rated at 9.87/10