@abc.abstractmethod<EOL><INDENT>def string_to_currency(self, s):<DEDENT>
return<EOL>
Parses a currency amount.

        :param s: a currency string
        :type s: ``string``
        :return: the currency amount
        :rtype: ``osid.financials.Currency``
        :raise: ``InvalidArgument`` -- s is not of ``get_currency_type()`` or s is not of ``get_numeric_format_type()``
        :raise: ``NullArgument`` -- ``s`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*