I'm having some troubles when it comes to multiplying two matrices. An AttributeError appears when I'm trying to perform the addition part

Traceback (most recent call last): File "MatrixClass.py", line 189, in <module> main() File "MatrixClass.py", line 184, in main mat.multiplyMatrixes(mat1,mat2) File "MatrixClass.py", line 176, in multiplyMatrixes self[i][j] += (m1[i][k])*(m2[k][j]) AttributeError: matrix instance has no attribute '__getitem__' 

I tried saving the new matrix in another instance called for example m3 but the I thought it would be better to use self instead.

Here's my code:

def multiplyMatrices(self,m1,m2): if m1.getRows() == m2.getColumns() and m1.getColumns() == m2.getRows(): self.setRows() self.setColumns() for i in range(m1.getRows()): for j in range(m2.getColumns()): for k in range(m1.getColumns()): self[i][j] += (m1[i][k])*(m2[k][j]) 

I created the instance of self in main(), before calling multiplyMatrices()

Thanks in advanced guys.

I'm having some troubles when it comes to multiplying two matrices. An AttributeError appears when I'm trying to perform the addition part

Traceback (most recent call last): File "MatrixClass.py", line 189, in <module> main() File "MatrixClass.py", line 184, in main mat.multiplyMatrixes(mat1,mat2) File "MatrixClass.py", line 176, in multiplyMatrixes self[i][j] += (m1[i][k])*(m2[k][j]) AttributeError: matrix instance has no attribute '__getitem__' 

I tried saving the new matrix in another instance called for example m3 but the I thought it would be better to use self instead.

Here's my code:

def multiplyMatrices(self,m1,m2): if m1.getRows() == m2.getColumns() and m1.getColumns() == m2.getRows(): self.setRows() self.setColumns() for i in range(m1.getRows()): for j in range(m2.getColumns()): for k in range(m1.getColumns()): self[i][j] += (m1[i][k])*(m2[k][j]) 

I created the instance of self in main(), before calling multiplyMatrices()