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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 _get_val(other):
 """ Given a Number, a Numeric Constant or a python number return its value """

    assert isinstance(other, (numbers.Number, SymbolNUMBER, SymbolCONST))
    if isinstance(other, SymbolNUMBER):
        return other.value

    if isinstance(other, SymbolCONST):
        return other.expr.value

    return other