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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def astype(array, y):
 """A functional form of the `astype` method. Args: array: The array or number to cast. y: An array or number, as the input, whose type should be that of array. Returns: An array or number with the same dtype as `y`. """

  if isinstance(y, autograd.core.Node):
    return array.astype(numpy.array(y.value).dtype)
  return array.astype(numpy.array(y).dtype)