diff --git a/src/omero/cli.py b/src/omero/cli.py
index 91eae68ab..b0d845a8b 100755
--- a/src/omero/cli.py
+++ b/src/omero/cli.py
@@ -665,7 +665,7 @@ class MyControl(BaseControl):
             def _configure(self, parser):
                 self.add_error("NAME", 100, "some message: %s")
                 ...
-            def __call__(self, \*args):
+            def __call__(self, *args):
                 self.raise_error("NAME", "my text")
     """
 
diff --git a/src/omero/install/win_set_path.py b/src/omero/install/win_set_path.py
index 10f27a93a..9bd908555 100755
--- a/src/omero/install/win_set_path.py
+++ b/src/omero/install/win_set_path.py
@@ -20,7 +20,7 @@
 
 
 def win_set_path(new_name=dummy, old_name=r"c:\omero_dist", dir=path(".")):
-    """
+    r"""
     Parses the Windows cfg and xml files and
     replaces the default "c:\omero_dist" with the
     given value.
@@ -77,7 +77,7 @@ def win_set_path(new_name=dummy, old_name=r"c:\omero_dist", dir=path(".")):
         print("Failed to set path: ", e)
         sys.exit(1)
 
-    print("""Usage: %s [oldname] newname
+    print(r"""Usage: %s [oldname] newname
 
 Replaces the [oldname] entries in the Windows configuration files
 with [newname]. By default, [oldname] is set to "c:\omero_dist"
diff --git a/src/omero/util/cleanse.py b/src/omero/util/cleanse.py
index 237cb7f35..1cc5658c7 100644
--- a/src/omero/util/cleanse.py
+++ b/src/omero/util/cleanse.py
@@ -162,20 +162,20 @@ def do_cleanse(self):
             if object_id.val not in existing_ids:
                 if object_id.val == -1:
                     if self.dry_run:
-                        print("   \_ %s (ignored/keep)" % path)
+                        print(r"   \_ %s (ignored/keep)" % path)
                 else:
                     size = os.stat(path)[ST_SIZE]
                     self.cleansed.append(path)
                     self.bytes_cleansed = size
                     if self.dry_run:
-                        print("   \_ %s (remove)" % path)
+                        print(r"   \_ %s (remove)" % path)
                     else:
                         try:
                             os.unlink(path)
                         except OSError as e:
                             print(e)
             elif self.dry_run:
-                print("   \_ %s (keep)" % path)
+                print(r"   \_ %s (keep)" % path)
         self.deferred_paths = list()
 
     def finalize(self):
@@ -260,7 +260,7 @@ def delete_empty_dirs(repo, root, client, dry_run):
 
     if dry_run:
         for directory in to_delete:
-            print("   \_ %s%s (remove)" % (root, directory))
+            print(r"   \_ %s%s (remove)" % (root, directory))
     elif to_delete:
         # probably less than a screenful
         batch_size = 20
diff --git a/src/omero/util/importperf.py b/src/omero/util/importperf.py
index 5a11bc391..8ee11b43f 100755
--- a/src/omero/util/importperf.py
+++ b/src/omero/util/importperf.py
@@ -103,8 +103,8 @@ class ImporterLog(object):
     # Regular expression for matching log4j log lines
     log_regex = re.compile(
         r'^(?P<date_time>\S+\s+\S+)\s+(?P<ms_elapsed>\d+)\s+'
-        '(?P<thread>\[.*?\])\s+(?P<level>\S+)\s+(?P<class>\S+)\s+-\s+'
-        '(?P<message>.*)$')
+        r'(?P<thread>\[.*?\])\s+(?P<level>\S+)\s+(?P<class>\S+)\s+-\s+'
+        r'(?P<message>.*)$')
 
     # Regular expression for matching possible OMERO.importer status messages
     status_regex = re.compile(r'^[A-Z_]*')