remove six

remove six in venus/exception.py
remove six in requirements.txt

Change-Id: If0401a01ccf2755a85fbc03ca31adb8a19962972

requirements.txt

@@ -22,7 +22,6 @@ oslo.versionedobjects>=0.9.0
 oslo.i18n>=1.5.0 # Apache-2.0
 osprofiler>=0.3.0 # Apache-2.0
 openstacksdk>=0.46.0 # Apache-2.0
-six>=1.9.0
 SQLAlchemy>=1.2.19 # MIT
 sqlalchemy-migrate>=0.9.6
 PyMySQL>=0.7.11

venus/exception.py

@@ -20,10 +20,8 @@ SHOULD include dedicated exception logging.
 
 """
 
-import sys
 
 from oslo_versionedobjects import exception as obj_exc
-import six
 import webob.exc
 
 from venus.common.utils import LOG
@@ -68,14 +66,13 @@ class VenusException(Exception):
 
         for k, v in self.kwargs.items():
             if isinstance(v, Exception):
-                self.kwargs[k] = six.text_type(v)
+                self.kwargs[k] = str(v)
 
         if self._should_format():
             try:
                 message = self.message % kwargs
 
-            except Exception:
-                exc_info = sys.exc_info()
+            except Exception as e:
                 # kwargs doesn't match a variable in the message
                 # log the issue and the kwargs
                 LOG.exception(_LE('Exception in string format operation'))
@@ -83,11 +80,11 @@ class VenusException(Exception):
                     LOG.error(_LE("%(name)s: %(value)s"),
                               {'name': name, 'value': value})
                 if CONF.fatal_exception_format_errors:
-                    six.reraise(*exc_info)
+                    raise e
                 # at least get the core message out if something happened
                 message = self.message
         elif isinstance(message, Exception):
-            message = six.text_type(message)
+            message = str(message)
 
         # NOTE(luisg): We put the actual message in 'msg' so that we can access
         # it, because if we try to access the message via 'message' it will be
@@ -99,7 +96,7 @@ class VenusException(Exception):
         return self.kwargs['message'] is None or '%(message)' in self.message
 
     def __unicode__(self):
-        return six.text_type(self.msg)
+        return str(self.msg)
 
 
 class NotAuthorized(VenusException):