The next two lines split the money across accounts.  They follow almost the same format as they do in Ledger: there's an account named, followed by a tab or two or more spaces, and then an expression.  Each time import2ledger generates an entry, it will evaluate this expression using the data it imported to calculate the actual currency amount to write.  Your expression can use numbers, basic arithmetic operators (including parentheses for grouping), conditional expressions in the format ``TRUE_EXPR if CONDITION else FALSE_EXPR``, and imported data referred to as ``{variable_name}``.

    SUPPORTED_NAMES = frozenset(['if', 'else'])

    SUPPORTED_OPS = frozenset([

        '(',

        ')',

        '+',

        '-',

        '*',

        '/',

        '==',

        '!=',

        '<',

        '<=',

        '>',

        '>=',

    ])

    def transform_NAME(self, ttype, tvalue):

        if tvalue in self.SUPPORTED_NAMES:

            yield from self._noop_transformer(ttype, tvalue)

        else:

            raise ValueError("unsupported bare word {!r}".format(tvalue))

[Conditional]

template =

 Assets:Cash  {amount} - (6 if {amount} > 50 else 3)

 Expenses:Banking Fees  (6 if {amount} > 50 else 3)

 Income:Sales  -{amount}

@pytest.mark.parametrize('amount,expect_fee', [

    (40, 3),

    (80, 6),

])

def test_conditional(amount, expect_fee):

    expect_cash = amount - expect_fee

    amount_s = '{:.02f}'.format(amount)

    render_vars = template_vars('Buyer', amount_s)

    lines = render_lines(render_vars, 'Conditional')

    assert lines == [

        "",

        "2015/03/14 Buyer",

        "  Assets:Cash  {:.02f} USD".format(expect_cash),

        "  Expenses:Banking Fees  {:.02f} USD".format(expect_fee),

        "  Income:Sales  -{} USD".format(amount_s),

    ]