m1 = [[1, 2, 3],
      [4, 5, 6]]
m2 = [[2, 3, 4],
       [5, 6, 7]]
 
def is_valid(x, y):
	if(not isinstance(x, list) or not isinstance(y, list) or len(x) != len(y)):
		return False
	return True
 
def soma_matrizes(m1, m2):
	res = []
	if(not is_valid(m1, m2)):
		return False
 
	for i, v in enumerate(m1):
		if(not is_valid(m1[i], m2[i])):
			return False
 
		u = []
		for x, y in enumerate(v):
			u.append(m1[i][x] + m2[i][x])
		res.append(u)
	return res
 
print(soma_matrizes(m1, m2))

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