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def append(arr, values, axis=None):
 """
 Append values to the end of an array.
 Parameters
 ----------
 arr : array_like
  Values are appended to a copy of this array.
 values : array_like
  These values are appended to a copy of `arr`. It must be of the
  correct shape (the same shape as `arr`, excluding `axis`). If
  `axis` is not specified, `values` can be any shape and will be
  flattened before use.
 axis : int, optional
  The axis along which `values` are appended. If `axis` is not
  given, both `arr` and `values` are flattened before use.
 Returns
 -------
 append : ndarray
  A copy of `arr` with `values` appended to `axis`. Note that
  `append` does not occur in-place: a new array is allocated and
  filled. If `axis` is None, `out` is a flattened array.

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