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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 ensure_dtype_float(x, default=np.float64):
 r"""Makes sure that x is type of float """

    if isinstance(x, np.ndarray):
        if x.dtype.kind == 'f':
            return x
        elif x.dtype.kind == 'i':
            return x.astype(default)
        else:
            raise TypeError('x is of type '+str(x.dtype)+' that cannot be converted to float')
    else:
        raise TypeError('x is not an array')