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

@@ -2,14 +2,14 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .product import *
+from . import product
 
 
 def register():
     Pool.register(
-        ProductAttributeSet,
-        ProductAttribute,
-        ProductAttributeAttributeSet,
-        Template,
-        Product,
+        product.AttributeSet,
+        product.Attribute,
+        product.AttributeAttributeSet,
+        product.Template,
+        product.Product,
         module='product_attribute', type_='model')

product.py

@@ -4,11 +4,8 @@ from trytond.model import ModelSQL, ModelView, DictSchemaMixin, fields
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval
 
-__all__ = ['ProductAttributeSet', 'ProductAttribute',
-    'ProductAttributeAttributeSet', 'Template', 'Product']
 
-
-class ProductAttributeSet(ModelSQL, ModelView, metaclass=PoolMeta):
+class AttributeSet(ModelSQL, ModelView, metaclass=PoolMeta):
     "Product Attribute Set"
     __name__ = 'product.attribute.set'
     name = fields.Char('Name', required=True, translate=True,
@@ -18,7 +15,7 @@ class ProductAttributeSet(ModelSQL, ModelView, metaclass=PoolMeta):
         help="Add attributes to the set.")
 
 
-class ProductAttribute(DictSchemaMixin, ModelSQL, ModelView, metaclass=PoolMeta):
+class Attribute(DictSchemaMixin, ModelSQL, ModelView, metaclass=PoolMeta):
     "Product Attribute"
     __name__ = 'product.attribute'
     sets = fields.Many2Many('product.attribute-product.attribute-set',
@@ -26,7 +23,7 @@ class ProductAttribute(DictSchemaMixin, ModelSQL, ModelView, metaclass=PoolMeta)
         help="Add sets to the attribute.")
 
 
-class ProductAttributeAttributeSet(ModelSQL, metaclass=PoolMeta):
+class AttributeAttributeSet(ModelSQL, metaclass=PoolMeta):
     "Product Attribute - Set"
     __name__ = 'product.attribute-product.attribute-set'
     attribute = fields.Many2One('product.attribute', 'Attribute',

setup.py

@@ -78,8 +78,8 @@ setup(name=name,
     keywords='tryton product attribute',
     package_dir={'trytond.modules.product_attribute': '.'},
     packages=(
-        ['trytond.modules.product_attribute'] +
-        ['trytond.modules.product_attribute.%s' % p for p in find_packages()]
+        ['trytond.modules.product_attribute']
+        + ['trytond.modules.product_attribute.%s' % p for p in find_packages()]
         ),
     package_data={
         'trytond.modules.product_attribute': (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)',

tests/__init__.py

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