chore(format-source): pyupgrade the code

.hg-format-source

@@ -68,3 +68,38 @@
 {"pattern": "yams/tools.py", "tool": "autoflake"}
 {"pattern": "yams/types.py", "tool": "autoflake"}
 {"pattern": "yams/xy.py", "tool": "autoflake"}
+{"pattern": "__pkginfo__.py", "tool": "pyupgrade"}
+{"pattern": "docs/conf.py", "tool": "pyupgrade"}
+{"pattern": "setup.py", "tool": "pyupgrade"}
+{"pattern": "test/data/__init__.py", "tool": "pyupgrade"}
+{"pattern": "test/data/dbmodel/__init__.py", "tool": "pyupgrade"}
+{"pattern": "test/data/dbmodel/blog.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema/Company.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema/Dates.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema/State.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema/__init__.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema/schema.py", "tool": "pyupgrade"}
+{"pattern": "test/data/schema_post_build_callback.py", "tool": "pyupgrade"}
+{"pattern": "test/data2/__init__.py", "tool": "pyupgrade"}
+{"pattern": "test/data2/schema.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_constraints.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_diff.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_reader.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_schema.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_schema2dot.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_serialize.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_specialization.py", "tool": "pyupgrade"}
+{"pattern": "test/unittest_xy.py", "tool": "pyupgrade"}
+{"pattern": "yams/__init__.py", "tool": "pyupgrade"}
+{"pattern": "yams/_exceptions.py", "tool": "pyupgrade"}
+{"pattern": "yams/buildobjs.py", "tool": "pyupgrade"}
+{"pattern": "yams/constraints.py", "tool": "pyupgrade"}
+{"pattern": "yams/diff.py", "tool": "pyupgrade"}
+{"pattern": "yams/interfaces.py", "tool": "pyupgrade"}
+{"pattern": "yams/reader.py", "tool": "pyupgrade"}
+{"pattern": "yams/schema.py", "tool": "pyupgrade"}
+{"pattern": "yams/schema2dot.py", "tool": "pyupgrade"}
+{"pattern": "yams/serialize.py", "tool": "pyupgrade"}
+{"pattern": "yams/tools.py", "tool": "pyupgrade"}
+{"pattern": "yams/types.py", "tool": "pyupgrade"}
+{"pattern": "yams/xy.py", "tool": "pyupgrade"}

setup.py

@@ -23,7 +23,6 @@
 __docformat__ = "restructuredtext en"
 
 import os.path as osp
-from io import open
 
 from setuptools import setup, find_packages
 

test/unittest_schema.py

-# -*- coding: iso-8859-1 -*-
 # copyright 2004-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #

test/unittest_schema2dot.py

@@ -49,8 +49,8 @@ splines=true
 class DotTC(TestCase):
     def test_schema2dot(self):
         """tests dot conversion without attributes information"""
-        wanted_entities = set(("Person", "Salaried", "Societe"))
-        skipped_entities = set(ent for ent in schema.entities() if ent.type not in wanted_entities)
+        wanted_entities = {"Person", "Salaried", "Societe"}
+        skipped_entities = {ent for ent in schema.entities() if ent.type not in wanted_entities}
         schema2dot.schema2dot(schema, "toto.dot", skiptypes=skipped_entities)
         generated = open("toto.dot").read()
         os.remove("toto.dot")

yams/buildobjs.py

@@ -1080,9 +1080,9 @@ class RelationDefinition(Definition):
         relation_schema = schema.relation_schema_for(yams_types.DefinitionName(name))
         if relation_schema.rule:
             raise BadSchemaDefinition(
-                'Cannot add relation definition "{0}" because an '
+                'Cannot add relation definition "{}" because an '
                 "homonymous computed relation already exists "
-                'with rule "{1}"'.format(relation_schema.type, relation_schema.rule)
+                'with rule "{}"'.format(relation_schema.type, relation_schema.rule)
             )
 
         if self.__permissions__ is MARKER:

yams/diff.py

@@ -20,7 +20,6 @@
 Textual representation of schema are created and standard diff algorithm are
 applied.
 """
-from __future__ import print_function
 
 import subprocess
 import tempfile

yams/reader.py

@@ -20,7 +20,6 @@
 Use either a sql derivated language for entities and relation definitions
 files or a direct python definition file.
 """
-from __future__ import print_function
 
 import sys
 import os

yams/schema2dot.py

@@ -18,7 +18,6 @@
 """Write a schema as a dot file.
 
 """
-from __future__ import print_function
 
 import sys
 import os.path as osp

yams/tools.py

 """some yams command line tools"""
-from __future__ import print_function
 
 import sys
 from os.path import exists, join, dirname