diff --git a/mail_attach_existing_attachment/__manifest__.py b/mail_attach_existing_attachment/__manifest__.py
index c907555..ef31957 100644
--- a/mail_attach_existing_attachment/__manifest__.py
+++ b/mail_attach_existing_attachment/__manifest__.py
@@ -22,21 +22,14 @@
 #
 ##############################################################################
 {
-    'name': "Mail Attach Existing Attachment",
-    'summary': "Adding attachment on the object by sending this one",
-    'author': "ACSONE SA/NV, "
-              "Tecnativa, "
-              "Odoo Community Association (OCA)",
-    'website': "https://github.com/OCA/social",
-    'category': 'Social Network',
-    'version': '12.0.1.0.0',
-    'license': 'AGPL-3',
-    'depends': [
-        'mail',
-        'document',
-    ],
-    'data': [
-        'wizard/mail_compose_message_view.xml',
-    ],
-    'installable': True,
+    "name": "Mail Attach Existing Attachment",
+    "summary": "Adding attachment on the object by sending this one",
+    "author": "ACSONE SA/NV, " "Tecnativa, " "Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/social",
+    "category": "Social Network",
+    "version": "12.0.1.0.0",
+    "license": "AGPL-3",
+    "depends": ["mail", "document"],
+    "data": ["wizard/mail_compose_message_view.xml"],
+    "installable": True,
 }
diff --git a/mail_attach_existing_attachment/tests/__init__.py b/mail_attach_existing_attachment/tests/__init__.py
index fc1e8e4..01f264c 100644
--- a/mail_attach_existing_attachment/tests/__init__.py
+++ b/mail_attach_existing_attachment/tests/__init__.py
@@ -1,2 +1 @@
-
 from . import test_mail_attach_existing_attachment
diff --git a/mail_attach_existing_attachment/tests/test_mail_attach_existing_attachment.py b/mail_attach_existing_attachment/tests/test_mail_attach_existing_attachment.py
index a6730e7..43d59b3 100644
--- a/mail_attach_existing_attachment/tests/test_mail_attach_existing_attachment.py
+++ b/mail_attach_existing_attachment/tests/test_mail_attach_existing_attachment.py
@@ -26,28 +26,34 @@ from odoo.tests import common
 
 
 class TestAttachExistingAttachment(common.TransactionCase):
-
     def setUp(self):
         super(TestAttachExistingAttachment, self).setUp()
-        self.partner_obj = self.env['res.partner']
-        self.partner_01 = self.env['res.partner'].create({
-            'name': 'Partner 1',
-            'email': 'partner1@example.org',
-            'is_company': True,
-            'parent_id': False,
-        })
+        self.partner_obj = self.env["res.partner"]
+        self.partner_01 = self.env["res.partner"].create(
+            {
+                "name": "Partner 1",
+                "email": "partner1@example.org",
+                "is_company": True,
+                "parent_id": False,
+            }
+        )
 
     def test_send_email_attachment(self):
-        attach1 = self.env['ir.attachment'].create({
-            'name': 'Attach1', 'datas_fname': 'Attach1',
-            'datas': 'bWlncmF0aW9uIHRlc3Q=',
-            'res_model': 'res.partner', 'res_id': self.partner_01.id})
-        vals = {'model': 'res.partner',
-                'partner_ids': [(6, 0, [self.partner_01.id])],
-                'res_id': self.partner_01.id,
-                'object_attachment_ids': [(6, 0, [attach1.id])]
-                }
-        mail = self.env['mail.compose.message'].create(vals)
+        attach1 = self.env["ir.attachment"].create(
+            {
+                "name": "Attach1",
+                "datas_fname": "Attach1",
+                "datas": "bWlncmF0aW9uIHRlc3Q=",
+                "res_model": "res.partner",
+                "res_id": self.partner_01.id,
+            }
+        )
+        vals = {
+            "model": "res.partner",
+            "partner_ids": [(6, 0, [self.partner_01.id])],
+            "res_id": self.partner_01.id,
+            "object_attachment_ids": [(6, 0, [attach1.id])],
+        }
+        mail = self.env["mail.compose.message"].create(vals)
         values = mail.get_mail_values([self.partner_01.id])
-        self.assertTrue(attach1.id in
-                        values[self.partner_01.id]['attachment_ids'])
+        self.assertTrue(attach1.id in values[self.partner_01.id]["attachment_ids"])
diff --git a/mail_attach_existing_attachment/wizard/mail_compose_message.py b/mail_attach_existing_attachment/wizard/mail_compose_message.py
index 5b4b32e..d42d9d5 100644
--- a/mail_attach_existing_attachment/wizard/mail_compose_message.py
+++ b/mail_attach_existing_attachment/wizard/mail_compose_message.py
@@ -22,32 +22,38 @@
 #
 ##############################################################################
 
-from odoo import models, fields, api
+from odoo import api, fields, models
 
 
 class MailComposeMessage(models.TransientModel):
-    _inherit = 'mail.compose.message'
+    _inherit = "mail.compose.message"
 
     @api.model
     def default_get(self, fields_list):
         res = super(MailComposeMessage, self).default_get(fields_list)
-        if res.get('res_id') and res.get('model') and \
-                res.get('composition_mode', '') != 'mass_mail' and\
-                not res.get('can_attach_attachment'):
-            res['can_attach_attachment'] = True  # pragma: no cover
+        if (
+            res.get("res_id")
+            and res.get("model")
+            and res.get("composition_mode", "") != "mass_mail"
+            and not res.get("can_attach_attachment")
+        ):
+            res["can_attach_attachment"] = True  # pragma: no cover
         return res
 
-    can_attach_attachment = fields.Boolean(string='Can Attach Attachment')
+    can_attach_attachment = fields.Boolean(string="Can Attach Attachment")
     object_attachment_ids = fields.Many2many(
-        comodel_name='ir.attachment',
-        relation='mail_compose_message_ir_attachments_object_rel',
-        column1='wizard_id', column2='attachment_id',
-        string='Object Attachments')
+        comodel_name="ir.attachment",
+        relation="mail_compose_message_ir_attachments_object_rel",
+        column1="wizard_id",
+        column2="attachment_id",
+        string="Object Attachments",
+    )
 
     @api.multi
     def get_mail_values(self, res_ids):
         res = super(MailComposeMessage, self).get_mail_values(res_ids)
         if self.object_attachment_ids.ids and self.model and len(res_ids) == 1:
-            res[res_ids[0]].setdefault('attachment_ids', []).extend(
-                self.object_attachment_ids.ids)
+            res[res_ids[0]].setdefault("attachment_ids", []).extend(
+                self.object_attachment_ids.ids
+            )
         return res