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+%22%22%22This module provides transfer function support.%0A%0ACopyright 2020 Michael Hayes, UCECE%0A%0A%22%22%22%0Afrom .expr import expr%0Afrom .units import u as uu%0A%0Adef transfer(arg, **assumptions):%0A%0A    expr1 = expr(arg, **assumptions)%0A    if expr1.is_admittance:%0A        return expr1.apply_unit(1 / uu.ohms)%0A%0A    try:%0A        expr1 = expr1.as_transfer()%0A    except:%0A        raise ValueError('Cannot represent %25s(%25s) as transfer function' %25 (expr1.__class__.__name__, expr1))%0A%0A    return expr1%0A%0A

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