diff --git a/cps/kobo.py b/cps/kobo.py
index 7e1cbc8e..f745a98a 100644
--- a/cps/kobo.py
+++ b/cps/kobo.py
@@ -31,7 +31,6 @@ from flask import (
     request,
     make_response,
     jsonify,
-    json,
     url_for,
     redirect,
 )
diff --git a/cps/kobo_auth.py b/cps/kobo_auth.py
index 60f3ea5f..48eee3cf 100644
--- a/cps/kobo_auth.py
+++ b/cps/kobo_auth.py
@@ -26,7 +26,9 @@ When first booting a Kobo device the user must sign into a Kobo (or affiliate) a
 Upon successful sign-in, the user is redirected to
     https://auth.kobobooks.com/CrossDomainSignIn?id=<some id>
 which serves the following response:
-    <script type='text/javascript'>location.href='kobo://UserAuthenticated?userId=<redacted>&userKey<redacted>&email=<redacted>&returnUrl=https%3a%2f%2fwww.kobo.com';</script>.
+    <script type='text/javascript'>
+        location.href='kobo://UserAuthenticated?userId=<redacted>&userKey<redacted>&email=<redacted>&returnUrl=https%3a%2f%2fwww.kobo.com';
+    </script>
 And triggers the insertion of a userKey into the device's User table.
 
 Together, the device's DeviceId and UserKey act as an *irrevocable* authentication
diff --git a/cps/services/SyncToken.py b/cps/services/SyncToken.py
index 21f16acc..903fff9a 100644
--- a/cps/services/SyncToken.py
+++ b/cps/services/SyncToken.py
@@ -84,7 +84,7 @@ class SyncToken():
     @staticmethod
     def from_headers(headers):
         sync_token_header = headers.get(SyncToken.SYNC_TOKEN_HEADER, "")
-        if sync_token_header == "":
+        if not sync_token_header:
             return SyncToken()
 
         # On the first sync from a Kobo device, we may receive the SyncToken
@@ -103,7 +103,7 @@ class SyncToken():
 
             data_json = sync_token_json["data"]
             validate(sync_token_json, SyncToken.data_schema_v1)
-        except (exceptions.ValidationError, ValueError) as e:
+        except (exceptions.ValidationError, ValueError):
             log.error("Sync token contents do not follow the expected json schema.")
             return SyncToken()