python3: use importlib.import_module to import backends

eopayment/__init__.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+import importlib
 import logging
 
 from .common import (URL, HTML, FORM, RECEIVED, ACCEPTED, PAID, DENIED,
@@ -23,7 +24,7 @@ logger = logging.getLogger(__name__)
 
 def get_backend(kind):
     '''Resolve a backend name into a module object'''
-    module = __import__(kind, globals(), locals(), [])
+    module = importlib.import_module('.' + kind, package='eopayment')
     return module.Payment
 
 __BACKENDS = [ DUMMY, SIPS, SIPS2, SYSTEMPAY, SPPLUS, OGONE, PAYBOX, PAYZEN, TIPI ]