diff --git a/lockfile/__init__.py b/lockfile/__init__.py

index 7bb7b35..668b426 100644

--- a/lockfile/__init__.py

+++ b/lockfile/__init__.py

@@ -1,4 +1,3 @@

-

 """

 lockfile.py - Platform-independent advisory file locks.

@@ -50,6 +49,8 @@ Exceptions:

             NotMyLock - File was locked but not by the current thread/process

 """

+from __future__ import absolute_import

+

 import sys

 import socket

 import os

@@ -257,7 +258,7 @@ def LinkFileLock(*args, **kwds):

     Do not use in new code.  Instead, import LinkLockFile from the

     lockfile.linklockfile module.

     """

-    import linklockfile

+    from . import linklockfile

     return _fl_helper(linklockfile.LinkLockFile, "lockfile.linklockfile",

                       *args, **kwds)

@@ -267,7 +268,7 @@ def MkdirFileLock(*args, **kwds):

     Do not use in new code.  Instead, import MkdirLockFile from the

     lockfile.mkdirlockfile module.

     """

-    import mkdirlockfile

+    from . import mkdirlockfile

     return _fl_helper(mkdirlockfile.MkdirLockFile, "lockfile.mkdirlockfile",

                       *args, **kwds)

@@ -277,7 +278,7 @@ def SQLiteFileLock(*args, **kwds):

     Do not use in new code.  Instead, import SQLiteLockFile from the

     lockfile.mkdirlockfile module.

     """

-    import sqlitelockfile

+    from . import sqlitelockfile

     return _fl_helper(sqlitelockfile.SQLiteLockFile, "lockfile.sqlitelockfile",

                       *args, **kwds)

@@ -306,10 +307,10 @@ def locked(path, timeout=None):

     return decor

 if hasattr(os, "link"):

-    import linklockfile as _llf

+    from . import linklockfile as _llf

     LockFile = _llf.LinkLockFile

 else:

-    import mkdirlockfile as _mlf

+    from . import mkdirlockfile as _mlf

     LockFile = _mlf.MkdirLockFile

 FileLock = LockFile

diff --git a/lockfile/pidlockfile.py b/lockfile/pidlockfile.py

index 3fc8f63..a965ba8 100644

--- a/lockfile/pidlockfile.py

+++ b/lockfile/pidlockfile.py

@@ -78,7 +78,7 @@ class PIDLockFile(LockBase):

         while True:

             try:

                 write_pid_to_pidfile(self.path)

-            except OSError, exc:

+            except OSError as exc:

                 if exc.errno == errno.EEXIST:

                     # The lock creation failed.  Maybe sleep a bit.

                     if timeout is not None and time.time() > end_time:

@@ -159,7 +159,7 @@ def write_pid_to_pidfile(pidfile_path):

         """

     open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)

-    open_mode = 0644

+    open_mode = 0o644

     pidfile_fd = os.open(pidfile_path, open_flags, open_mode)

     pidfile = os.fdopen(pidfile_fd, 'w')

@@ -186,7 +186,7 @@ def remove_existing_pidfile(pidfile_path):

         """

     try:

         os.remove(pidfile_path)

-    except OSError, exc:

+    except OSError as exc:

         if exc.errno == errno.ENOENT:

             pass

         else:

diff --git a/lockfile/sqlitelockfile.py b/lockfile/sqlitelockfile.py

index ec75490..d596229 100644

--- a/lockfile/sqlitelockfile.py

+++ b/lockfile/sqlitelockfile.py

@@ -3,6 +3,11 @@ from __future__ import absolute_import, division

 import time

 import os

+try:

+    unicode

+except NameError:

+    unicode = str

+

 from . import LockBase, NotLocked, NotMyLock, LockTimeout, AlreadyLocked

 class SQLiteLockFile(LockBase):

inherit eutils

src_unpack() {

    unpack ${A}

    cd "${S}"

    epatch "${FILESDIR}/${P}-py3k.patch"

}