Hi, i am a newbe developper in Odoo12, I am actually creating a text file in attachment. Odoo seems to create this file in utf-8 format, but i need this file to be in ASCII format.

Here is my code so far :

def create_attachment(self, filename, payment_file_str):
    attachment = self.env['ir.attachment'].create({
        'res_model': self._name,
        'res_id': self.id,
        'name': filename,
        'datas': base64.b64encode(payment_file_str), # base64.b64encode(payment_file_str)   payment_file_str.encode('latin-1').encode('base64')
        'datas_fname': filename,
    })
    simplified_form_view = self.env.ref(
        'customer_payment_order.view_attachment_simplified_form')
    action = {
        'name': _('Payment File'),
        'view_mode': 'form',
        'view_id': simplified_form_view.id,
        'res_model': 'ir.attachment',
        'type': 'ir.actions.act_window',
        'target': 'current',
        'res_id': attachment.id,
    }

    return action