[英]Python ndarray with dtype=object
How can I access data inside a numpy array with dtype=object?如何使用 dtype=object 访问 numpy 数组中的数据?
b = numpy.array({"a":[1,2,3]}, dtype=object) b = numpy.array({"a":[1,2,3]}, dtype=object)
The following gives IndexError.下面给出 IndexError。
print(b["a"]) IndexError: only integers, slices (
:
), ellipsis (...
), numpy.newaxis (None
) and integer or boolean arrays are valid indices print(b["a"]) IndexError: only integers, slices (:
), ellipsis (...
), numpy.newaxis (None
) and integer or boolean arrays are valid indices
Since you passed in the dict to numpy.array()
without putting it in a list, this is a zero-dimensional array.由于您将 dict 传递给numpy.array()
而不将其放入列表中,因此这是一个零维数组。 To index into a zero-dimensional array, you can use b.item()
to access the element inside.要索引到零维数组,您可以使用b.item()
来访问里面的元素。 For completeness, to access the data in the "a"
key in your dictionary, you can use this.为了完整起见,要访问字典中"a"
键中的数据,您可以使用它。
>>> b.item()["a"]
[1, 2, 3]
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