module can be installd + format

models/account_invoice.py

@@ -11,13 +11,13 @@ class AccountInvoice(models.Model):
         error_message = ""
         if any(not so.contract_annex_id.contract_id for so in sale_order_ids):
             error_message = _("There is a Sale order without binding contract.")
-        if any(not so.contract_annex_id  for so in sale_order_ids):
+        if any(not so.contract_annex_id for so in sale_order_ids):
             error_message = _("There is a Sale order without annex.")
         if error_message:
             raise UserError(error_message)
 
     def action_invoice_print(self):
-        '''
+        """
         for so in self.env["sale.order"].search([]):
             if self.id in so.invoice_ids.ids:
                 order = so
@@ -32,16 +32,16 @@ class AccountInvoice(models.Model):
                 )
             )
         self.sent = True
-        '''
+        """
 
-        sale_orders_ids = self.env["sale.order"].search([
+        sale_orders_ids = self.env["sale.order"].search(
-            ("invoice_ids", "in", self.ids)
+            [("invoice_ids", "in", self.ids)]
-        ])
+        )
         if not sale_orders_ids:
             return super().action_invoice_print()
 
         self.check_contract_presence(sale_orders_ids)
-        self.filtered(lambda inv: not inv.is_move_sent).write({'is_move_sent': True})
+        self.filtered(lambda inv: not inv.is_move_sent).write({"is_move_sent": True})
 
         view = self.env.ref(
             "{}.res_partner_wizard_print_document_view".format(MODULE_NAME)

models/res_partner_contract.py

@@ -3,13 +3,19 @@ import datetime
 from odoo import _, fields, models
 
 from ..utils import MODULE_NAME
+
 # from ..utils.misc import Extension, IDocument
 
 
-class PartnerContract(models.Model):    #, IDocument, Extension):
+class PartnerContract(models.Model):  # , IDocument, Extension):
     _name = "res.partner.contract"
     _description = "Contract"
-    _inherit = ["mail.thread", "mail.activity.mixin", "mail.followers", "client_contracts.utils"]
+    _inherit = [
+        "mail.thread",
+        "mail.activity.mixin",
+        "mail.followers",
+        "client_contracts.utils",
+    ]
 
     def _get_default_name(self):
         """Returns name format `№YYMM-D-N`,

models/res_partner_contract_annex.py

@@ -3,10 +3,11 @@ import math
 from odoo import _, api, fields, models
 
 from ..utils import MODULE_NAME
+
 # from ..utils.misc import Extension, IDocument
 
 
-class ContractOrderAnnex(models.Model):    # , IDocument, Extension):
+class ContractOrderAnnex(models.Model):  # , IDocument, Extension):
     _name = "res.partner.contract.annex"
     _inherit = ["client_contracts.utils"]
     _description = "Contract Annex"

utils/misc.py

@@ -1,7 +1,8 @@
 import datetime as dt
+
 # import inspect
 
-from odoo import models   # , fields
+from odoo import models  # , fields
 from odoo.tools.misc import DEFAULT_SERVER_DATE_FORMAT, DEFAULT_SERVER_DATETIME_FORMAT
 
 

wizard/res_partner_contract_wizard.py

@@ -6,12 +6,13 @@ from odoo.exceptions import ValidationError
 
 from ..utils import MODULE_NAME
 from ..utils.docxtpl import get_document_from_values_stream
+
 # from ..utils.misc import Extension
 
 _logger = logging.getLogger(__name__)
 
 
-class ContractWizard(models.TransientModel):    #, Extension):
+class ContractWizard(models.TransientModel):  # , Extension):
     _name = "res.partner.contract.wizard"
     _inherit = ["client_contracts.utils"]