Write binary data into zip file and downlaod it on button click in odoo

writing_binary_field_into_zipfile_in_odoo.py

    @api.multi
    def odoo_button_click(self):
        print('****************odoo_button_click******************')
        import os, zipfile
        # function to convert binary data 
        def isBase64_decodestring(s):
            try:
                return base64.decodestring(s)
            except Exception as e:
                raise ValidationError('Error:', +str(e))

        # getting working module where your current python file (model.py) exists
        path = os.path.dirname(os.path.realpath(__file__)) 

        # creating dynamic path to create zip file
        file_name = "static\\src\\any_folder\\"  + str(self.field_1.name.strip().replace(' ', '_').replace('-', '_')) + '_' + str(self.name.strip().replace(' ', '_'))
        file_name_zip = file_name+".rar"
        zipfilepath = os.path.join(path, file_name_zip)        
        # creating zip file in above mentioned path
        zip_archive = zipfile.ZipFile(zipfilepath, "w")

        # creating file name (like example.txt) in which we have to write binary field data or attachment
        object_name = self.binary_field_name 
        object_handle = open(object_name, "w")
        # writing binary data into file handle
        object_handle.write(isBase64_decodestring(self.attachment)) 
        object_handle.close()
        # writing file into zip file
        zip_archive.write(object_name)
        zip_archive.close()

        # code snipet for downloading zip file
        return {
                'type': 'ir.actions.act_url',
                'url': str('/your_module/static/src/any_folder/'+str(zip_file_name_with_rar_extension),
                'target': 'new',
        }

For details: http://learnopenerp.blogspot.com/2020/06/write-binary-data-nto-zip-file-and-downlaod-it-on-button-click-in-odoo.html