models.py

# -*- coding: utf-8 -*-
##############################################################################
# For copyright and license notices, see __manifest__.py file in module root
# directory
##############################################################################
from odoo import models, fields, api
from odoo.exceptions import UserError,ValidationError
from datetime import datetime
from bs4 import BeautifulSoup

import requests

class ResCurrency(models.Model):
	_inherit = 'res.currency'

	@api.model
	def update_dolarbna(self):
		dolarbna_url = self.env['ir.config_parameter'].get_param('dolar_bna','https://www.bna.com.ar/Personas')
		if not dolarbna_url:
			raise UserError('No esta presente URL de BNA')
		page = requests.get(dolarbna_url)
		soup = BeautifulSoup(page.content, "html.parser")
		results = soup.find(id="billetes")
		tds = results.find_all("td",class_=False)
		if len(tds) < 2:
			raise ValidationError('No se puede determinar el dolar BNA #1')
		#try:
		value = tds[1].text 
		value = value.replace('<td>','')
		value = value.replace('</td>','')
		value = float(value.replace(',','.'))
		#except:
	    	#    raise ValidationError('No se puede determinar el valor BNA #2')
		currency_id = self.search([('name','=','USD')])
		if currency_id:
			vals = {
				'name': str(datetime.now())[:10],
				'currency_id': currency_id.id,
				'rate': 1 / value
				}
			rate = self.env['res.currency.rate'].search([('currency_id','=',currency_id.id),('name','=',str(datetime.now())[:10])])
			if not rate:
				return_id = self.env['res.currency.rate'].create(vals)