diff --git a/addons/purchase/models/purchase_order_line.py b/addons/purchase/models/purchase_order_line.py
index 0360c0cb173..74d7e6cfc3e 100644
--- a/addons/purchase/models/purchase_order_line.py
+++ b/addons/purchase/models/purchase_order_line.py
@@ -89,7 +89,7 @@ class PurchaseOrderLine(models.Model):
     def _compute_amount(self):
         for line in self:
             tax_results = self.env['account.tax']._compute_taxes([line._convert_to_tax_base_line_dict()])
-            totals = list(tax_results['totals'].values())[0]
+            totals = next(iter(tax_results['totals'].values()))
             amount_untaxed = totals['amount_untaxed']
             amount_tax = totals['amount_tax']
 
@@ -564,9 +564,11 @@ class PurchaseOrderLine(models.Model):
             )
 
     def _validate_analytic_distribution(self):
-        for line in self.filtered(lambda l: not l.display_type):
-            line._validate_distribution(**{
-                'product': line.product_id.id,
-                'business_domain': 'purchase_order',
-                'company_id': line.company_id.id,
-            })
+        for line in self:
+            if line.display_type:
+                continue
+            line._validate_distribution(
+                product=line.product_id.id,
+                business_domain='purchase_order',
+                company_id=line.company_id.id,
+            )
diff --git a/addons/purchase_stock/models/purchase_order.py b/addons/purchase_stock/models/purchase_order.py
index 35233691782..9d684c35caf 100644
--- a/addons/purchase_stock/models/purchase_order.py
+++ b/addons/purchase_stock/models/purchase_order.py
@@ -131,9 +131,9 @@ class PurchaseOrder(models.Model):
             for pick in order.picking_ids.filtered(lambda r: r.state != 'cancel'):
                 pick.action_cancel()
 
-            order.order_line.write({'move_dest_ids':[(5,0,0)]})
+            order.order_line.write({'move_dest_ids': [(5, 0, 0)]})
 
-        return super(PurchaseOrder, self).button_cancel()
+        return super().button_cancel()
 
     def action_view_picking(self):
         return self._get_action_view_picking(self.picking_ids)
diff --git a/addons/purchase_stock/models/purchase_order_line.py b/addons/purchase_stock/models/purchase_order_line.py
index fd2c8eceed9..4b1c1612273 100644
--- a/addons/purchase_stock/models/purchase_order_line.py
+++ b/addons/purchase_stock/models/purchase_order_line.py
@@ -213,14 +213,14 @@ class PurchaseOrderLine(models.Model):
 
         move_dests = self.move_dest_ids
         if not move_dests:
-            move_dests = self.move_ids.move_dest_ids.filtered(lambda m: m.state != 'cancel' and not m.location_dest_id.usage == 'supplier')
+            move_dests = self.move_ids.move_dest_ids.filtered(lambda m: m.state != 'cancel' and m.location_dest_id.usage != 'supplier')
 
         if not move_dests:
             qty_to_attach = 0
             qty_to_push = self.product_qty - qty
         else:
             move_dests_initial_demand = self.product_id.uom_id._compute_quantity(
-                sum(move_dests.filtered(lambda m: m.state != 'cancel' and not m.location_dest_id.usage == 'supplier').mapped('product_qty')),
+                sum(move_dests.filtered(lambda m: m.state != 'cancel' and m.location_dest_id.usage != 'supplier').mapped('product_qty')),
                 self.product_uom, rounding_method='HALF-UP')
             qty_to_attach = move_dests_initial_demand - qty
             qty_to_push = self.product_qty - move_dests_initial_demand