class_matrix

class matrix:
    def __init__(self,numRows,numColumns):
    #@param:
    #   numRow: int;
    #   numColumns: int;
        self.rows = numRows
        self.cols = numColumns
        self.mat = {}
    def printMat(self):
        keys = list(self.mat.keys())
        p = makeMatrix(self.rows,self.cols)
        for i in range(0,len(keys)):
            m = int(keys[i][0])
            n = int(keys[i][1])
            p[m][n] = self.mat[keys[i]]
        for i in range(0,len(p)):
            print(p[i])
    def value(self,i):
    #@param:
    #   i: tuple, (row_index,col_index);
    #   return: float
        return(self.mat[i])
    def modif(self,i,v):
    #@param:
    #   i: tuple, (row_index,col_index);
    #   v: float;
        self.mat[i] = v
    def add(self,i,v):
    #@param:
    #   i: tuple, (row_index,col_index);
    #   v: float;
        self.mat[i] = v
    def matSum(self,otherMat):
    #@param:
    #   otherMat: dict, class_matrix;
    #   return: dict, class_matrix;
        if self.rows!=otherMat.rows or self.cols!=otherMat.cols:
            print("Matrices are not compatrible")
            return []
        else:
            key = list(otherMat.mat.keys())
            for i in key:
                self.mat[i] = self.mat.get(i,0) + otherMat.mat[i]