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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 args_to_int(mapping, argument):
 """ Convert list of strings to an int using a mapping. """

    if isinstance(argument, int):
        if argument == 0:
            return 0
        deprecation('passing extensions and flags as constants is deprecated')
        return argument
    elif isinstance(argument, (tuple, list)):
        return reduce(op.or_, [mapping[n] for n in set(argument) if n in mapping], 0)
    raise TypeError('argument must be a list of strings or an int')