关于Numpy array类型 TypeError: 'tuple' object is not callable

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若编码时会出现以下错误

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from PIL import Image
a= Image.open('1.png')
a_num = np.array(a)
a_num.shape()

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TypeError                                 Traceback (most recent call last)
<ipython-input-19-5a33b2b479d7> in <module>
----> 1 a_num.shape()

TypeError: 'tuple' object is not callable

将a_num.shape() -----> a_num.shape[:]