Upport the "mark invoice as sent" wizard from v8 to v10

PEP8 on account_usability

account_usability/account.py

@@ -6,7 +6,6 @@
 from odoo import models, fields, api, _
 from odoo.tools import float_compare, float_is_zero
 from odoo.exceptions import UserError
-from itertools import groupby
 
 
 class AccountInvoice(models.Model):
@@ -79,8 +78,8 @@ class AccountInvoice(models.Model):
     # generated from customer invoices linked to the partners' account because:
     # 1) the label of an account move line is an important field, we can't
     #    write a rubbish '/' in it !
-    # 2) the 'name' field of the account.move.line is used in the overdue letter,
-    # and '/' is not meaningful for our customer !
+    # 2) the 'name' field of the account.move.line is used in the overdue
+    # letter, and '/' is not meaningful for our customer !
     @api.multi
     def action_move_create(self):
         res = super(AccountInvoice, self).action_move_create()
@@ -134,8 +133,10 @@ class AccountJournal(models.Model):
             return res
         else:
             for journal in self:
-                currency = journal.currency_id or journal.company_id.currency_id
-                name = "[%s] %s (%s)" % (journal.code, journal.name, currency.name)
+                currency = journal.currency_id or\
+                    journal.company_id.currency_id
+                name = "[%s] %s (%s)" % (
+                    journal.code, journal.name, currency.name)
                 res.append((journal.id, name))
             return res
 
@@ -193,8 +194,8 @@ class AccountAnalyticAccount(models.Model):
 class AccountMove(models.Model):
     _inherit = 'account.move'
 
-    default_move_line_name = fields.Char(string='Default Label',
-        states={'posted': [('readonly', True)]})
+    default_move_line_name = fields.Char(
+        string='Default Label', states={'posted': [('readonly', True)]})
     # By default, we can still modify "ref" when account move is posted
     # which seems a bit lazy for me...
     ref = fields.Char(states={'posted': [('readonly', True)]})
@@ -303,7 +304,7 @@ class AccountBankStatementLine(models.Model):
     # is caused by this.
     # Set search_reconciliation_proposition to False by default
     # TODO: re-write in v10
-    #def get_data_for_reconciliations(
+    # def get_data_for_reconciliations(
     #        self, cr, uid, ids, excluded_ids=None,
     #        search_reconciliation_proposition=False, context=None):
     #    # Make variable name shorted for PEP8 !
@@ -323,8 +324,8 @@ class AccountBankStatementLine(models.Model):
         # 2) The name of the statement line is already written in the name of
         # the move line -> not useful to have the info 2 times
         # In the end, I think it's better to just put nothing (we could write
-        # the name of the statement which has the account number, but it doesn't
-        # bring any useful info to the accountant)
+        # the name of the statement which has the account number, but it
+        # doesn't bring any useful info to the accountant)
         # The only "good" thing to do would be to have a sequence per
         # statement line and write it in this 'ref' field
         # But that would required an additionnal field on statement lines