zodb warnings removed

--HG--
branch : sandbox

src/misc/batch_rename.py

@@ -26,8 +26,9 @@ class Error(Exception):
 # Star.Trek.The.Next.Generation.1x01-02.Encounter.At.Farpoint.DVDRip-AMC.[tvu.org.ru].avi
 # Star Trek TNG - 1x01-2 - Encounter At Farpoint - DVDRip-AMC.divx.avi
 
+
 def main(argv=None):
-    if argv == None:
+    if argv is None:
         argv = sys.argv
     LOG.info("starting [%s]" % (argv[0],))
     try:
@@ -42,7 +43,7 @@ def main(argv = None):
         # tng = r"c:\Dokumente\Eigene Videos\Shaun the Sheep"
         tng = "."
         # os.chdir(tng)
-        for (dirpath, dirnames, filenames) in os.walk(tng):
+        for (_, _, filenames) in os.walk(tng):
             for f in filenames:
                 mot = re.match(p, f)
                 if mot is not None:

src/zodb/tutorial.py

@@ -1,9 +1,14 @@
-#! /usr/bin/env python2
+#!/usr/bin/env python
 # -*- coding: cp1252 -*-
+# Copyright (c) 2014 Andreas
+# See LICENSE for details.
 
-# ZODB Tutorial
+""" tutorial """
 
-""" zodb.tutorial """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
 
 # imports
 
@@ -14,6 +19,7 @@ import transaction
 
 # Persistent objects
 
+
 class Account(Persistent):
     def __init__(self):
         self.balance = 0.0
@@ -27,29 +33,35 @@ class Account(Persistent):
 
 # Configuration
 
-storage = FileStorage(r"e:\workspaces\zodb3\data.zodb")
+storage = FileStorage(r"e:\workspaces\zodb3\tutorial.zodb")
 db = DB(storage)
-connection = db.open()
-root = connection.root()
+ctx = db.open()
+root = ctx.root()
 
-print root.keys()
+print(root.keys())
 
 # Storing objects
 
-root['account-1'] = Account()
-if "account-2" not in root: 
-    root['account-2'] = Account()
+a = b = Account()
 
+root['account-1'] = a
+if "account-2" not in root:
+    root['account-2'] = b
+
+print("id(a): {}, id(b): {}".format(id(a), id(b)))
 # Transactions
 root['account-2'].deposit(5)
 transaction.commit()
-print root.keys()
+print(root.keys())
 
 del root['account-1']
-print root.keys()
+print(root.keys())
 # ['account-2']
 transaction.abort()
-print root.keys()
+print(root.keys())
 # ['account-1', 'account-2']
 
-print root['account-2'].balance 
+print(root['account-2'].balance)
+a = root['account-1']
+b = root['account-2']
+print("id(a): {}, id(b): {}".format(id(a), id(b)))