If you want to get currency in param in Odoo then follow the following code in your .py file.

incl_tax = prod_taxes.filtered(lambda tax: tax not in line_taxes and tax.price_include)
        if incl_tax:
            return incl_tax.compute_all(price)['total_excluded']
        return price

class AccountOperationTemplate(models.Model):
    _name = "account.operation.template"
    _description = "Preset to create journal entries during a invoices and payments matching"

    name = fields.Char(string='Button Label', required=True)
    sequence = fields.Integer(required=True, default=10)
    has_second_line = fields.Boolean(string='Add a second line', default=False)
    company_id = fields.Many2one('res.company', string='Company', required=True, default=lambda self: self.env.user.company_id)

    account_id = fields.Many2one('account.account', string='Account', ondelete='cascade', domain=[('deprecated', '=', False)])
    journal_id = fields.Many2one('account.journal', string='Journal', ondelete='cascade', help="This field is ignored in a bank statement reconciliation.")
    label = fields.Char(string='Journal Item Label')
    amount_type = fields.Selection([
        ('fixed', 'Fixed'),
        ('percentage', 'Percentage of balance')
        ], required=True, default='percentage')
    amount = fields.Float(digits=0, required=True, default=100.0, help="Fixed amount will count as a debit if it is negative, as a credit if it is positive.")
    tax_id = fields.Many2one('account.tax', string='Tax', ondelete='restrict', domain=[('type_tax_use', '=', 'purchase')])
    analytic_account_id = fields.Many2one('account.analytic.account', string='Analytic Account', ondelete='set null', domain=[('state', 'not in', ('close', 'cancelled'))])

    second_account_id = fields.Many2one('account.account', string='Account', ondelete='cascade', domain=[('deprecated', '=', False)])
    second_journal_id = fields.Many2one('account.journal', string='Journal', ondelete='cascade', help="This field is ignored in a bank statement reconciliation.")
    second_label = fields.Char(string='Journal Item Label')
    second_amount_type = fields.Selection([
        ('fixed', 'Fixed'),
        ('percentage', 'Percentage of amount')
        ], string='Amount type', required=True, default='percentage')
    second_amount = fields.Float(string='Amount', digits=0, required=True, default=100.0, help="Fixed amount will count as a debit if it is negative, as a credit if it is positive.")
    second_tax_id = fields.Many2one('account.tax', string='Tax', ondelete='restrict', domain=[('type_tax_use', '=', 'purchase')])
    second_analytic_account_id = fields.Many2one('account.analytic.account', string='Analytic Account', ondelete='set null', domain=[('state', 'not in', ('close', 'cancelled'))])

    @api.onchange('name')
    def onchange_name(self):
        self.label = self.name