46、'memoryview', 返回给定参数的内存查看对象(Momory view)。所谓内存查看对象，是指对支持缓冲区协议的数据进行包装，在不需要复制对象基础上允许Python代码访问。
class memoryview(object) | Create a new memoryview object which references the given object. | | Methods defined here: | | __delitem__(self, key, /) | Delete self[key]. | | __enter__(...) | | __eq__(self, value, /) | Return self==value. | | __exit__(...) | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(self, key, /) | Return self[key]. | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __ne__(self, value, /) | Return self!=value. | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | __repr__(self, /) | Return repr(self). | | __setitem__(self, key, value, /) | Set self[key] to value. | | cast(self, /, format, *, shape) | Cast a memoryview to a new format or shape. | | hex(self, /) | Return the data in the buffer as a string of hexadecimal numbers. | | release(self, /) | Release the underlying buffer exposed by the memoryview object. | | tobytes(self, /) | Return the data in the buffer as a byte string. | | tolist(self, /) | Return the data in the buffer as a list of elements. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | c_contiguous | A bool indicating whether the memory is C contiguous. | | contiguous | A bool indicating whether the memory is contiguous. | | f_contiguous | A bool indicating whether the memory is Fortran contiguous. | | format | A string containing the format (in struct module style) | for each element in the view. | | itemsize | The size in bytes of each element of the memoryview. | | nbytes | The amount of space in bytes that the array would use in | a contiguous representation. | | ndim | An integer indicating how many dimensions of a multi-dimensional | array the memory represents. | | obj | The underlying object of the memoryview. | | readonly | A bool indicating whether the memory is read only. | | shape | A tuple of ndim integers giving the shape of the memory | as an N-dimensional array. | | strides | A tuple of ndim integers giving the size in bytes to access | each element for each dimension of the array. | | suboffsets | A tuple of integers used internally for PIL-style arrays.