Fix flake8 errors and warnings

We add the flake8 configuration used so we ensure everyone uses the same.
We remove the usage of __all__ for non public API.
When possible, we rationalize the class name according to its __name__ and module.

issue9082
review297061002

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+ignore=E123,E124,E126,E128,W503

__init__.py

@@ -2,16 +2,16 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .party import *
-from .sale import *
+from . import party
+from . import sale
 from . import configuration
 
 
 def register():
     Pool.register(
-        Party,
-        PartySaleShipmentGroupingMethod,
-        Sale,
+        party.Party,
+        party.PartySaleShipmentGroupingMethod,
+        sale.Sale,
         configuration.Configuration,
         configuration.ConfigurationSaleMethod,
         module='sale_shipment_grouping', type_='model')

configuration.py

@@ -3,9 +3,6 @@
 from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
 
-__all__ = ['Configuration', 'ConfigurationSaleMethod']
-
-
 sale_shipment_grouping_method = fields.Selection(
     'get_sale_shipment_grouping_methods', "Sale Shipment Grouping Method",
     help="The default shipment grouping method for new customers.")

party.py

@@ -5,8 +5,6 @@ from trytond.model import ModelSQL, ValueMixin, fields
 from trytond.pool import PoolMeta, Pool
 from trytond.tools.multivalue import migrate_property
 
-__all__ = ['Party', 'PartySaleShipmentGroupingMethod']
-
 
 class Party(metaclass=PoolMeta):
     __name__ = 'party.party'

sale.py

@@ -4,8 +4,6 @@
 from trytond.pool import PoolMeta
 from trytond.transaction import Transaction
 
-__all__ = ['Sale']
-
 
 class Sale(metaclass=PoolMeta):
     __name__ = 'sale.sale'

setup.py

@@ -79,8 +79,9 @@ setup(name=name,
     keywords='tryton sale shipment grouping',
     package_dir={'trytond.modules.sale_shipment_grouping': '.'},
     packages=(
-        ['trytond.modules.sale_shipment_grouping'] +
-        ['trytond.modules.sale_shipment_grouping.%s' % p for p in find_packages()]
+        ['trytond.modules.sale_shipment_grouping']
+        + ['trytond.modules.sale_shipment_grouping.%s' % p
+            for p in find_packages()]
         ),
     package_data={
         'trytond.modules.sale_shipment_grouping': (info.get('xml', [])
@@ -93,7 +94,8 @@ setup(name=name,
         'Intended Audience :: Developers',
         'Intended Audience :: Financial and Insurance Industry',
         'Intended Audience :: Legal Industry',
-        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+        'License :: OSI Approved :: '
+        'GNU General Public License v3 or later (GPLv3+)',
         'Natural Language :: Bulgarian',
         'Natural Language :: Catalan',
         'Natural Language :: Chinese (Simplified)',

tests/__init__.py

@@ -2,7 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 
 try:
-    from trytond.modules.sale_shipment_grouping.tests.test_sale_shipment_grouping import suite
+    from trytond.modules.sale_shipment_grouping.tests.test_sale_shipment_grouping import suite  # noqa: E501
 except ImportError:
     from .test_sale_shipment_grouping import suite