diff --git a/cellxgene_gateway/backend_cache.py b/cellxgene_gateway/backend_cache.py
index e54654e..3fbf306 100644
--- a/cellxgene_gateway/backend_cache.py
+++ b/cellxgene_gateway/backend_cache.py
@@ -30,7 +30,11 @@ class BackendCache:
 
     def check_entry(self, dataset):
         contents = self.entry_list
-        matches = [c for c in contents if c.dataset == dataset and c.status != "terminated"]
+        matches = [
+            c
+            for c in contents
+            if c.dataset == dataset and c.status != "terminated"
+        ]
 
         if len(matches) == 0:
             return None
@@ -61,7 +65,7 @@ class BackendCache:
         time.sleep(1)  # Automatic refresh is too fast, needs a second to pause
 
         return entry
-    
+
     def prune(self, process):
         self.entry_list.remove(process)
         process.terminate()
diff --git a/cellxgene_gateway/cache_entry.py b/cellxgene_gateway/cache_entry.py
index 829d3c5..0a61441 100644
--- a/cellxgene_gateway/cache_entry.py
+++ b/cellxgene_gateway/cache_entry.py
@@ -67,7 +67,7 @@ class CacheEntry:
         self.stderr = stderr
         self.http_status = http_status
         self.status = "error"
-    
+
     def append_output(self, output):
         if self.all_output == None:
             self.all_output = output
@@ -83,7 +83,6 @@ class CacheEntry:
             p.terminate()
         self.status = "terminated"
 
-
     def serve_content(self, path):
         dataset = self.dataset
 
diff --git a/cellxgene_gateway/env.py b/cellxgene_gateway/env.py
index 828d07d..9e58c2b 100644
--- a/cellxgene_gateway/env.py
+++ b/cellxgene_gateway/env.py
@@ -25,6 +25,7 @@ env_vars = {
     "GATEWAY_IP": ip,
 }
 
+
 def validate():
     if not all(env_vars.values()):
         raise ValueError(
diff --git a/cellxgene_gateway/extra_scripts.py b/cellxgene_gateway/extra_scripts.py
index 14c2c30..db15ab0 100644
--- a/cellxgene_gateway/extra_scripts.py
+++ b/cellxgene_gateway/extra_scripts.py
@@ -10,6 +10,7 @@
 from cellxgene_gateway import env
 from json import loads
 
+
 def get_extra_scripts():
     # can be array of script tags to inject on every page, e.g. for google analytics could be
     # ['https://www.googletagmanager.com/gtag/js?id=UA-123456-2',
diff --git a/cellxgene_gateway/gateway.py b/cellxgene_gateway/gateway.py
index 0586655..c84af9e 100644
--- a/cellxgene_gateway/gateway.py
+++ b/cellxgene_gateway/gateway.py
@@ -48,7 +48,7 @@ def handle_invalid_usage(error):
             "cellxgene_error.html",
             extra_scripts=get_extra_scripts(),
             message=message,
-            path=error.path
+            path=error.path,
         ),
         error.http_status,
     )
@@ -187,11 +187,10 @@ def do_view(path):
     elif match.status == "error":
         raise ProcessException.from_cache_entry(match)
 
+
 @app.route("/cache_status", methods=["GET"])
 def do_GET_status():
-    return render_template(
-        "cache_status.html", entry_list=cache.entry_list
-    )
+    return render_template("cache_status.html", entry_list=cache.entry_list)
 
 
 @app.route("/relaunch/<path:path>", methods=["GET"])
@@ -200,7 +199,8 @@ def do_relaunch(path):
     match = cache.check_entry(dataset)
     if not match is None:
         match.terminate()
-    return redirect(url_for('do_view', path=path), code=302)
+    return redirect(url_for("do_view", path=path), code=302)
+
 
 def main():
     env.validate()
diff --git a/cellxgene_gateway/prune_process_cache.py b/cellxgene_gateway/prune_process_cache.py
index 1829d51..60afc99 100644
--- a/cellxgene_gateway/prune_process_cache.py
+++ b/cellxgene_gateway/prune_process_cache.py
@@ -33,5 +33,4 @@ class PruneProcessCache:
                 try:
                     cache.prune(process)
                 except Exception as detail:
-                    print('failed to prune process:', detail)
-
+                    print("failed to prune process:", detail)