python基础（3）：列表

有数学运算是要注意操作数类型！

print([3]*5)
输出：[3, 3, 3, 3, 3]
print([3]*5+[7])
输出：[3, 3, 3, 3, 3, 7]

数组、张量、列表

a=torch.tensor([[1,2],[3,5]])
b=np.array([[1,2],[3,4]])
print(b.flatten())  # ==》[1 2 3 4]
print(a.flatten())  # ==》tensor([1, 2, 3, 5])

print(list(a))  # ==》[tensor([1, 2]), tensor([3, 5])]
print(list(b))  # ==》[array([1, 2]), array([3, 4])]

print(list(b.flatten()))  # ==》[1, 2, 3, 4]
print(list(a.flatten()))  # ==》[tensor(1), tensor(2), tensor(3), tensor(5)]