AttributeError: ‘list‘ object has no attribute ‘ndim‘

AttributeError                            Traceback (most recent call last)
<ipython-input-6-9b77ac20aa23> in <module>()
      1 # Print the `images` dimensions
----> 2 print(images.ndim)
      3 
      4 # Print the number of `images`'s elements
      5 print(images.size)
AttributeError: 'list' object has no attribute 'ndim'

#源代码
input=[1,2,3]
#修改后
input=np.array(input)