Migrate to python 3.

configuration.py

@@ -4,8 +4,7 @@ from trytond.pool import PoolMeta
 __all__ = ['Configuration']
 
 
-class Configuration:
-    __metaclass__ = PoolMeta
+class Configuration(metaclass=PoolMeta):
     __name__ = 'production.configuration'
     check_state_operation = fields.Selection([
             (None, ''),

operation.py

@@ -227,8 +227,7 @@ class OperationTracking(ModelSQL, ModelView):
         return 2
 
 
-class Production:
-    __metaclass__ = PoolMeta
+class Production(metaclass=PoolMeta):
     __name__ = 'production'
 
     route = fields.Many2One('production.route', 'Route',

setup.py

@@ -5,10 +5,7 @@ from setuptools import setup
 import re
 import os
 import io
-try:
-    from configparser import ConfigParser
-except ImportError:
-    from ConfigParser import ConfigParser
+from configparser import ConfigParser
 
 MODULE = 'production_operation'
 PREFIX = 'nantic'

tests/scenario_production_operation.rst

@@ -173,7 +173,7 @@ Create an Inventory::
     >>> inventory.save()
     >>> Inventory.confirm([inventory.id], config.context)
     >>> inventory.state
-    u'done'
+    'done'
 
 Make a production::
 
@@ -201,7 +201,7 @@ Make a production::
     True
     >>> Production.wait([production.id], config.context)
     >>> production.state
-    u'waiting'
+    'waiting'
     >>> Production.assign_try([production.id], config.context)
     True
     >>> production.reload()
@@ -236,6 +236,6 @@ Make a production::
     >>> Operation.done(operations, config.context)
     >>> production.reload()
     >>> production.state
-    u'done'
+    'done'
     >>> production.cost
     Decimal('100.0000')