python numpy数组追加在.py文件中不起作用，但在终端中起作用 [英] python numpy array append not working in .py file, but works in terminal

问题描述

我正在尝试使用 np.append 附加到一个 numpy 数组.

I am trying to append to a numpy array using np.append.

例如

a = np.array([1])

np.append(a, [2])

此代码在终端中运行良好(结果为 array([1, 2]))，但是当我运行包含相同代码的 .py 文件时它不起作用.当我在附加 [2] 后打印 a 时，它仍然是 [1].

this code works well in terminal (the result is array([1, 2])), but it won't work when I run a .py file including the same code included in it. When I print a after appending [2], it would still be [1].

这是我的 test.py 文件的代码:

Here is the code for my test.py file:

import numpy as np

a = np.array([1])
print(a)
np.append(a, [2])
print(a)

这是用终端运行它的结果:

and this is the result of running it with terminal:

python test.py
[1]
[1]

没有错误的错误结果.有谁知道可能是什么问题?

Wrong result with no error. Does anyone know what could possibly be the problem?

推荐答案

import numpy as np
a = np.array([1])
print(a)
a = np.append(a, [2])
print(a)

numpy.append(arr, values, axis=None)，其中 arr 是将值附加到该数组的副本(http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.append.html).

numpy.append(arr, values, axis=None), where arr is values are appended to a copy of this array (http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.append.html).

在终端中你的代码可以工作，因为 np.append(a,[2]) 变成了 print np.append(a,[2]).

In terminal your code works because np.append(a,[2]) become print np.append(a,[2]).

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