Make lint happy

Sorry, but some of flake8 complaints are really stupid...

src/ZODB/DemoStorage.py

@@ -256,7 +256,6 @@ class DemoStorage(ConflictResolvingStorage):
         # regular data record
         return data, serial, next_serial
 
-
     def loadBlob(self, oid, serial):
         try:
             return self.changes.loadBlob(oid, serial)

src/ZODB/interfaces.py

@@ -889,25 +889,28 @@ class IPrefetchStorage(IStorage):
         more than once.
         """
 
+
 class IStorageLoadBeforeEx(Interface):
 
     def loadBeforeEx(oid, before):  # -> (data, serial)
         """Load object data as observed before given database state.
 
-        loadBeforeEx returns data for object with given object ID as observed by
-        most recent database transaction with ID < before. Two values are returned:
+        loadBeforeEx returns data for object with given object ID as observed
+        by most recent database transaction with ID < before. Two values are
+        returned:
 
         - The data record,
         - The transaction ID of the data record.
 
-        If the object does not exist, or is deleted as of requested database state,
-        loadBeforeEx returns data=None, and serial indicates transaction ID of the
-        most recent deletion done in transaction with ID < before, or null tid if
-        there is no such deletion.
+        If the object does not exist, or is deleted as of requested database
+        state, loadBeforeEx returns data=None, and serial indicates transaction
+        ID of the most recent deletion done in transaction with ID < before, or
+        null tid if there is no such deletion.
 
         Note: no POSKeyError is raised even if object id is not in the storage.
         """
 
+
 class IMultiCommitStorage(IStorage):
     """A multi-commit storage can commit multiple transactions at once.
 

src/ZODB/mvccadapter.py

@@ -10,7 +10,8 @@ also simplifies the implementation of the DB and Connection classes.
 import zope.interface
 
 from . import interfaces, serialize, POSException
-from .utils import p64, u64, z64, maxtid, Lock, loadBeforeEx, oid_repr, tid_repr
+from .utils import p64, u64, z64, maxtid, Lock, loadBeforeEx, oid_repr, \
+                   tid_repr
 
 
 class Base(object):
@@ -158,11 +159,12 @@ class MVCCAdapterInstance(Base):
         data, serial = loadBeforeEx(self._storage, oid, self._start)
         if data is None:
             # raise POSKeyError if object does not exist at all
-            # TODO raise POSKeyError always and switch to raising ReadOnlyError only when
-            # actually detecting that load is being affected by simultaneous pack (see below).
+            # TODO raise POSKeyError always and switch to raising ReadOnlyError
+            # only when actually detecting that load is being affected by
+            # simultaneous pack (see below).
             if serial == z64:
-                # XXX second call to loadBeforeEx - it will become unneeded once we
-                # switch to raising POSKeyError.
+                # XXX second call to loadBeforeEx - it will become unneeded
+                # once we switch to raising POSKeyError.
                 _, serial_exists = loadBeforeEx(self._storage, oid, maxtid)
                 if serial_exists == z64:
                     # object does not exist at all

src/ZODB/tests/hexstorage.py

@@ -39,7 +39,8 @@ class HexStorage(object):
                 setattr(self, name, v)
 
         zope.interface.directlyProvides(self, zope.interface.providedBy(base))
-        if hasattr(base, 'loadBeforeEx') and 'loadBeforeEx' not in self.copied_methods:
+        if hasattr(base, 'loadBeforeEx') and \
+           'loadBeforeEx' not in self.copied_methods:
             def loadBeforeEx(oid, before):
                 data, serial = self.base.loadBeforeEx(oid, before)
                 if data is not None:

src/ZODB/tests/testDemoStorage.py

@@ -270,7 +270,10 @@ def load_before_base_storage_current():
     >>> base.close()
     """
 
-# additional DemoStorage tests that do not fit into common DemoStorageTests setup.
+# additional DemoStorage tests that do not fit into common DemoStorageTests
+# setup.
+
+
 class DemoStorageTests2(ZODB.tests.util.TestCase):
     def checkLoadAfterDelete(self):
         """Verify that DemoStorage correctly handles load requests for objects
@@ -314,7 +317,8 @@ class DemoStorageTests2(ZODB.tests.util.TestCase):
         obj = root['obj']
         oid = obj._p_oid
         obj.value += 1
-        # modify root as well so that there is root revision saved in overlay that points to obj
+        # modify root as well so that there is root revision saved in overlay
+        # that points to obj
         root['x'] = 1
         transaction.commit()
         atLive = obj._p_serial
@@ -333,7 +337,8 @@ class DemoStorageTests2(ZODB.tests.util.TestCase):
         # simulate GC on base+overlay
         zoverlay = FileStorage("overlay.fs")
         txn = transaction.get()
-        txn_meta = TransactionMetaData(txn.user, txn.description, txn.extension)
+        txn_meta = TransactionMetaData(txn.user, txn.description,
+                                       txn.extension)
         zoverlay.tpc_begin(txn_meta)
         zoverlay.deleteObject(oid, atLive, txn_meta)
         zoverlay.tpc_vote(txn_meta)

src/ZODB/utils.py

@@ -406,6 +406,8 @@ def load_current(storage, oid, version=''):
 
 
 _loadBeforeExWarned = set()  # of storage class
+
+
 def loadBeforeEx(storage, oid, before):
     """loadBeforeEx provides IStorageLoadBeforeEx semantic for all storages.
 
@@ -430,16 +432,21 @@ def loadBeforeEx(storage, oid, before):
         # DemoStorage (https://github.com/zopefoundation/ZODB/issues/318), so
         # emit corresponding warning.
         if type(storage) not in _loadBeforeExWarned:
-            # there is potential race around _loadBeforeExWarned access, but due to the
-            # GIL this race cannot result in that set corruption, and can only lead
-            # to us emitting the warning twice instead of just once.
-            # -> do not spend CPU on lock and just ignore it.
+            # there is potential race around _loadBeforeExWarned access, but
+            # due to the GIL this race cannot result in that set corruption,
+            # and can only lead to us emitting the warning twice instead of
+            # just once.  -> do not spend CPU on lock and just ignore it.
             warnings.warn(
-                "FIXME %s does not provide loadBeforeEx - emulating it via loadBefore, but ...\n"
+                "FIXME %s does not provide loadBeforeEx - emulating it via "
+                "loadBefore, but ...\n"
                 "\t... 1) access is be potentially slower, and\n"
-                "\t... 2) not full semantic of loadBeforeEx could be provided.\n"
-                "\t...    this can lead to data corruption in the presence of delete records.\n"
-                "\t... -> please see https://github.com/zopefoundation/ZODB/issues/318 for details." %
+                "\t... 2) not full semantic of loadBeforeEx could be "
+                "provided.\n"
+                "\t...    this can lead to data corruption in the presence "
+                "of delete records.\n"
+                "\t... -> please see "
+                "https://github.com/zopefoundation/ZODB/issues/318 for "
+                "details." %
                 type(storage), PendingDeprecationWarning)
             _loadBeforeExWarned.add(type(storage))
         return (None, z64)