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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 array2string(arr: numpy.ndarray) -> str: """Format numpy array as a string."""

        shape = str(arr.shape)[1:-1]
        if shape.endswith(","):
            shape = shape[:-1]
        return numpy.array2string(arr, threshold=11) + "%s[%s]" % (arr.dtype, shape)