Migrate to py3

address.py

@@ -7,8 +7,7 @@ from trytond.pool import Pool, PoolMeta
 __all__ = ['Address']
 
 
-class Address:
-    __metaclass__ = PoolMeta
+class Address(metaclass=PoolMeta):
     __name__ = 'party.address'
 
     @staticmethod

configuration.py

@@ -11,8 +11,7 @@ __all__ = ['Configuration', 'ConfigurationCountry']
 default_country = fields.Many2One('country.country', 'Default Country')
 
 
-class Configuration:
-    __metaclass__ = PoolMeta
+class Configuration(metaclass=PoolMeta):
     __name__ = 'party.configuration'
     default_country = fields.MultiValue(default_country)
 

setup.py

@@ -7,10 +7,7 @@ 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 = 'country_zip'
 PREFIX = 'trytonspain'