doc strings

src/ZODB/tests/HistoryStorage.py

-# Run the history() related tests for a storage.  Any storage that supports
-# the history() method should be able to pass all these tests.
+"""Run the history() related tests for a storage.
+
+Any storage that supports the history() method should be able to pass
+all these tests.
+"""
 
 from ZODB.tests.MinPO import MinPO
 from ZODB.tests.StorageTestBase import zodb_unpickle

src/ZODB/tests/IteratorStorage.py

-# Run tests against the iterator() interface for storages.  Any storage that
-# supports the iterator() method should be able to pass all these tests.
+"""Run tests against the iterator() interface for storages.
+
+Any storage that supports the iterator() method should be able to pass
+all these tests.
+"""
 
 from ZODB.tests.MinPO import MinPO
 from ZODB.tests.StorageTestBase import zodb_unpickle

src/ZODB/tests/PackableStorage.py

-# Run some tests relevant for storages that support pack()
+"""Run some tests relevant for storages that support pack()."""
 
 try:
     import cPickle
@@ -18,7 +18,6 @@ from ZODB.referencesf import referencesf
 
 ZERO = '\0'*8
 
-
 
 # This class is for the root object.  It must not contain a getoid() method
 # (really, attribute).  The persistent pickling machinery -- in the dumps()

src/ZODB/tests/StorageTestBase.py

-# This class must be one of the mixin base class for your storage test.  It
-# provides basic setUp() and tearDown() semantics (which you can override),
-# and it also provides a helper method _dostore() which performs a complete
-# store transaction for a single object revision.
+"""Provide a mixin base class for storage tests.
+
+The StorageTestBase class provides basic setUp() and tearDown()
+semantics (which you can override), and it also provides a helper
+method _dostore() which performs a complete store transaction for a
+single object revision.
+"""
 
 import pickle
 import string
@@ -18,6 +21,7 @@ from ZODB.tests.MinPO import MinPO
 ZERO = '\0'*8
 
 def zodb_pickle(obj):
+    """Create a pickle in the format expected by ZODB."""
     f = StringIO()
     p = Pickler(f, 1)
     klass = obj.__class__
@@ -35,6 +39,7 @@ def zodb_pickle(obj):
     return f.getvalue(1)
 
 def zodb_unpickle(data):
+    """Unpickle an object stored using the format expected by ZODB."""
     f = StringIO(data)
     u = Unpickler(f)
     klass_info = u.load()

src/ZODB/tests/TransactionalUndoStorage.py

-# Check transactionalUndo().  Any storage that supports transactionalUndo()
-# must pass these tests.
+"""Check transactionalUndo().
+
+Any storage that supports transactionalUndo() must pass these tests.
+"""
 
 import types
 from ZODB import POSException