Python 2D numpy数组的形状不正确

我想创建5x5 numpy阵列。声明如下：

aa = np.array([[2.82842712, 2.23606798, 2.0, 2.23606798, 2.82842712],
               [2.23606798, 1.41421356, 1.0, 1.41421356, 2.23606789],
               [2.0,        1.0,        0.0, 1.0,        2.0],
               [2.23606789, 1,41421356, 1.0, 1.41421356, 2.23606789],
               [2.82842712, 2.23606789, 2.0, 2.23606798, 2.82842712]])

MATRICE aa:
[[2.82842712, 2.23606798, 2.0, 2.23606798, 2.82842712]
 [2.23606798, 1.41421356, 1.0, 1.41421356, 2.23606789]
 [2.0, 1.0, 0.0, 1.0, 2.0]
 [2.23606789, 1, 41421356, 1.0, 1.41421356, 2.23606789]
 [2.82842712, 2.23606789, 2.0, 2.23606798, 2.82842712]]
Shape: (5,)

但当我检查它的大小是5x1

控制台阵列中打印的内容如下所示：

aa = np.array([[2.82842712, 2.23606798, 2.0, 2.23606798, 2.82842712],
               [2.23606798, 1.41421356, 1.0, 1.41421356, 2.23606789],
               [2.0,        1.0,        0.0, 1.0,        2.0],
               [2.23606789, 1,41421356, 1.0, 1.41421356, 2.23606789],
               [2.82842712, 2.23606789, 2.0, 2.23606798, 2.82842712]])

MATRICE aa:
[[2.82842712, 2.23606798, 2.0, 2.23606798, 2.82842712]
 [2.23606798, 1.41421356, 1.0, 1.41421356, 2.23606789]
 [2.0, 1.0, 0.0, 1.0, 2.0]
 [2.23606789, 1, 41421356, 1.0, 1.41421356, 2.23606789]
 [2.82842712, 2.23606789, 2.0, 2.23606798, 2.82842712]]
Shape: (5,)

---

有人知道我错在哪里吗？

第四行有六个元素，

[2.23606789，141421356，1.0，1.41421356，2.23606789]

假设是

1.41421356

更改为：

import numpy as np

aa = np.array([[2.82842712, 2.23606798, 2.0, 2.23606798, 2.82842712],
               [2.23606798, 1.41421356, 1.0, 1.41421356, 2.23606789],
               [2.0,        1.0,        0.0, 1.0,        2.0],
               [2.23606789, 1.41421356, 1.0, 1.41421356, 2.23606789],
               [2.82842712, 2.23606789, 2.0, 2.23606798, 2.82842712]])



print(aa.shape)

输出

(5, 5)

---

正如@FHTMitchell所提到的，numpy only自动转换矩形矩阵。

您可能想解释为什么会出现这种情况——即numpy only自动转换矩形矩阵非常感谢！我完全忽略了它！