首页'numpy.ndarray' object has no attribute 'extend'

'numpy.ndarray' object has no attribute 'extend'

时间: 2023-09-17 07:12:16 浏览: 146

This error occurs when you try to use the extend() method on a numpy.ndarray object, which doesn't have this method. The extend() method is used to add elements to the end of a list, but numpy arrays don't work like Python lists. To add elements to a numpy array, you can use the concatenate() method or the append() method. Example using concatenate(): ``` import numpy as np arr1 = np.array([1, 2, 3]) arr2 = np.array([4, 5, 6]) arr1 = np.concatenate([arr1, arr2]) print(arr1) ``` Output: ``` [1 2 3 4 5 6] ``` Example using append(): ``` import numpy as np arr1 = np.array([1, 2, 3]) arr2 = np.array([4, 5, 6]) arr1 = np.append(arr1, arr2) print(arr1) ``` Output: ``` [1 2 3 4 5 6] ```

numpy.ndarray' object has no attribute 'extend'

这个错误提示是因为 numpy.ndarray 没有 extend() 方法。如果想要增加一个或多个元素到一个 ndarray 中，可以使用 numpy.append() 方法或 numpy.concatenate() 方法。例如，如果要将一个列表添加到一个 ndarray 中，可以使用 numpy.append(ndarray, [list]) 的方式。具体用法可参考 numpy 的官方文档。

AttributeError: 'numpy.ndarray' object has no attribute 'extend'

This error occurs when you try to use the `extend` method on a NumPy array. The `extend` method is not defined for NumPy arrays because they are fixed in size and cannot be extended like regular Python lists. To solve this error, you can convert the NumPy array to a Python list using the `tolist()` method and then use the `extend` method. For example: ``` import numpy as np # create a NumPy array arr = np.array([1, 2, 3]) # convert the array to a list and extend it lst = arr.tolist() lst.extend([4, 5, 6]) print(lst) ``` Output: ``` [1, 2, 3, 4, 5, 6] ```

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