Matrix Diagonal dominante

matriz.py

>>> def eh_diagonal_dominante(matriz):
...     for i, linha in enumerate(matriz):
...         soma = sum(linha)
...         item_diagonal = linha[i]
...         if item_diagonal <= (soma - item_diagonal):
...             return False
...     return True
... 
>>> eh_diagonal_dominante([
... [2, 1],
... [1, 2]])
True
>>> eh_diagonal_dominante([
... [2, 1],
... [2, 1]])
False