diff --git a/capa/ida/ida_capa_explorer.py b/capa/ida/ida_capa_explorer.py
index 06f23b8b..f42c0978 100644
--- a/capa/ida/ida_capa_explorer.py
+++ b/capa/ida/ida_capa_explorer.py
@@ -376,7 +376,7 @@ class CapaExplorerForm(idaapi.PluginForm):
             "analysis": {
                 # "format" is difficult to determine via IDAPython
                 "extractor": "ida",
-            }
+            },
         }
 
         doc = capa.render.convert_capabilities_to_result_document(meta, rules, capabilities)
diff --git a/capa/main.py b/capa/main.py
index 4d5850e6..9d3d96e0 100644
--- a/capa/main.py
+++ b/capa/main.py
@@ -327,7 +327,7 @@ def collect_metadata(argv, path, format, extractor):
     sha1 = hashlib.sha1()
     sha256 = hashlib.sha256()
 
-    with open(path, 'rb') as f:
+    with open(path, "rb") as f:
         buf = f.read()
 
     md5.update(buf)
@@ -343,10 +343,7 @@ def collect_metadata(argv, path, format, extractor):
             "sha256": sha256.hexdigest(),
             "path": os.path.normpath(path),
         },
-        "analysis": {
-            "format": format,
-            "extractor": extractor.__class__.__name__,
-        },
+        "analysis": {"format": format, "extractor": extractor.__class__.__name__,},
     }
 
 
diff --git a/capa/render/__init__.py b/capa/render/__init__.py
index a9ba1784..5b625217 100644
--- a/capa/render/__init__.py
+++ b/capa/render/__init__.py
@@ -258,6 +258,7 @@ def render_default(meta, rules, capabilities):
 
 class CapaJsonObjectEncoder(json.JSONEncoder):
     """JSON encoder that emits Python sets as sorted lists"""
+
     def default(self, obj):
         if isinstance(obj, (list, dict, int, float, bool, type(None))) or isinstance(obj, six.string_types):
             return json.JSONEncoder.default(self, obj)