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

@@ -2,17 +2,17 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .product import *
-from .stock import *
+from . import product
+from . import stock
 
 
 def register():
     Pool.register(
-        Template,
-        Product,
-        Configuration,
-        ConfigurationLotShelfLife,
-        Lot,
-        Move,
-        Period,
+        product.Template,
+        product.Product,
+        stock.Configuration,
+        stock.ConfigurationLotShelfLife,
+        stock.Lot,
+        stock.Move,
+        stock.Period,
         module='stock_lot_sled', type_='model')

product.py

@@ -6,8 +6,6 @@ from trytond.pyson import Eval
 
 from .stock import DATE_STATE
 
-__all__ = ['Template', 'Product']
-
 
 class Template(metaclass=PoolMeta):
     __name__ = 'product.template'

setup.py

@@ -78,8 +78,8 @@ setup(name=name,
     keywords='tryton stock lot',
     package_dir={'trytond.modules.stock_lot_sled': '.'},
     packages=(
-        ['trytond.modules.stock_lot_sled'] +
-        ['trytond.modules.stock_lot_sled.%s' % p for p in find_packages()]
+        ['trytond.modules.stock_lot_sled']
+        + ['trytond.modules.stock_lot_sled.%s' % p for p in find_packages()]
         ),
     package_data={
         'trytond.modules.stock_lot_sled': (info.get('xml', [])
@@ -93,7 +93,8 @@ setup(name=name,
         'Intended Audience :: Financial and Insurance Industry',
         'Intended Audience :: Legal Industry',
         'Intended Audience :: Manufacturing',
-        '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)',

stock.py

@@ -16,9 +16,6 @@ from trytond.tools import grouped_slice
 from trytond.modules.stock.exceptions import PeriodCloseError
 from .exceptions import LotExpiredError, LotExpiredWarning
 
-__all__ = ['Configuration', 'ConfigurationLotShelfLife',
-    'Lot', 'Move', 'Period']
-
 DATE_STATE = [
     ('none', 'None'),
     ('optional', 'Optional'),
@@ -327,10 +324,10 @@ class Move(metaclass=PoolMeta):
                         if add_join(sub_query.from_, lot):
                             # only lot expiring during the period
                             clause = (
-                                (lot.shelf_life_expiration_date >=
-                                    stock_date_start)
-                                & (lot.shelf_life_expiration_date <
-                                    stock_date_end))
+                                (lot.shelf_life_expiration_date
+                                    >= stock_date_start)
+                                & (lot.shelf_life_expiration_date
+                                    < stock_date_end))
                             if sub_query.where:
                                 sub_query.where &= clause
                             else: