Odoo Save excel file on Binary and open to process

py

import openpyxl
from openerp import models, fields, api, _
from tempfile import TemporaryFile

class ExcelReader(models.TransientModel):
    _name="reader_excel"

    excel_file = fields.Binary(string='Excel File')

    def import_excel(self):
        # Generating of the excel file to be read by openpyxl
        file = self.excel_file.decode('base64')
        excel_fileobj = TemporaryFile('wb+')
        excel_fileobj.write(file)
        excel_fileobj.seek(0)

        # Create workbook
        workbook = openpyxl.load_workbook(excel_fileobj, data_only=True)
        # Get the first sheet of excel file
        sheet = workbook[workbook.get_sheet_names()[0]]

        # Iteration on each rows in excel
        for row in sheet.rows:
            # Get value
            v1 = row[0].value 
            v2 = row[1].value 
            v3 = row[2].value 
            # Create your record 
            self.env['your_model'].creaate({'val1':v1,'val2':v2, 'val3':v3'})

Hi in Odoo 12 this solution doesn't works

This line :
file = self.excel_file.decode('base64')

Generate this error :
LookupError: 'base64' is not a text encoding; use codecs.decode() to handle arbitrary codecs

I propose this solution
At file top:
import base64

And replace line by :
file = base64.decodebytes(self.excel_file)

decode('base64') is works for python2