diff --git a/stix2/sources/__init__.py b/stix2/sources/__init__.py
index eecb447..f30e815 100644
--- a/stix2/sources/__init__.py
+++ b/stix2/sources/__init__.py
@@ -263,8 +263,8 @@ class CompositeDataSource(object):
                     break
 
             if allowed:
-                #no need for further checks if filter is missing parameters
-    
+                # no need for further checks if filter is missing parameters
+
                 # check filter field is a supported STIX 2.0 common field
                 if filter_['field'] not in STIX_COMMON_FIELDS:
                     allowed = False
@@ -506,7 +506,7 @@ class DataSource(object):
                     break
 
             if allowed:
-                #no reason for further checks if missing filter parameters
+                # no reason for further checks if missing filter parameters
 
                 # check filter field is a supported STIX 2.0 common field
                 if filter_['field'] not in STIX_COMMON_FIELDS:
diff --git a/stix2/sources/taxii.py b/stix2/sources/taxii.py
index aa1b224..09c1b9d 100644
--- a/stix2/sources/taxii.py
+++ b/stix2/sources/taxii.py
@@ -21,7 +21,7 @@ class TAXIIDataSource(DataSource):
         if not api_root:
             api_root = "http://localhost:5000"
         if not auth:
-            auth = {"user":"admin", "pass":"taxii"}
+            auth = {"user": "admin", "pass": "taxii"}
 
         self.taxii_info = {
             "api_root": {
@@ -117,7 +117,7 @@ class TAXIIDataSource(DataSource):
                 Source (if this data source is attached to one)
 
         Returns:
-            The query results with filters applied. 
+            The query results with filters applied.
         """
 
         # make query in TAXII query format since 'id' is TAXII field