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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 _is_zero(x):
 """ Returns True if x is numerically 0 or an array with 0's. """

    if x is None:
        return True
    if isinstance(x, numbers.Number):
        return x == 0.0
    if isinstance(x, np.ndarray):
        return np.all(x == 0)
    return False