diff --git a/development/stock-linux-json.py b/development/stock-linux-json.py
index c863d41e4..877f78e1c 100644
--- a/development/stock-linux-json.py
+++ b/development/stock-linux-json.py
@@ -87,7 +87,7 @@ class Downloader:
         output_filename = 'unknown-kernel.json'
         for named_file in named_files:
             prefix = '--system-map'
-            if not 'System' in named_files[named_file]:
+            if 'System' not in named_files[named_file]:
                 prefix = '--elf'
                 output_filename = './' + '-'.join((named_file.split('/')[-1]).split('-')[2:])[:-4] + '.json.xz'
             args += [prefix, named_files[named_file]]
diff --git a/volatility3/cli/__init__.py b/volatility3/cli/__init__.py
index 608fdf79c..2c5e13211 100644
--- a/volatility3/cli/__init__.py
+++ b/volatility3/cli/__init__.py
@@ -543,7 +543,7 @@ class CommandLine:
                 self._file = io.open(fd, mode = 'w+b')
                 CLIFileHandler.__init__(self, filename)
                 for item in dir(self._file):
-                    if not item.startswith('_') and not item in ['closed', 'close', 'mode', 'name']:
+                    if not item.startswith('_') and item not in ('closed', 'close', 'mode', 'name'):
                         setattr(self, item, getattr(self._file, item))
 
             def __getattr__(self, item):
diff --git a/volatility3/framework/layers/resources.py b/volatility3/framework/layers/resources.py
index b6ef1b6ba..7ace25290 100644
--- a/volatility3/framework/layers/resources.py
+++ b/volatility3/framework/layers/resources.py
@@ -82,7 +82,7 @@ class ResourceAccessor(object):
         """Determines whether a URLs contents should be cached"""
         parsed_url = urllib.parse.urlparse(url)
 
-        return self._enable_cache and not parsed_url.scheme in self._non_cached_schemes()
+        return self._enable_cache and parsed_url.scheme not in self._non_cached_schemes()
 
     @staticmethod
     def _non_cached_schemes() -> List[str]:
diff --git a/volatility3/framework/plugins/linux/check_creds.py b/volatility3/framework/plugins/linux/check_creds.py
index 613469eed..9bc1a067d 100644
--- a/volatility3/framework/plugins/linux/check_creds.py
+++ b/volatility3/framework/plugins/linux/check_creds.py
@@ -44,7 +44,7 @@ class Check_creds(interfaces.plugins.PluginInterface):
 
             cred_addr = task.cred.dereference().vol.offset
 
-            if not cred_addr in creds:
+            if cred_addr not in creds:
                 creds[cred_addr] = []
 
             creds[cred_addr].append(task.pid)
diff --git a/volatility3/framework/plugins/mac/list_files.py b/volatility3/framework/plugins/mac/list_files.py
index 19f28b18f..8bae986b7 100644
--- a/volatility3/framework/plugins/mac/list_files.py
+++ b/volatility3/framework/plugins/mac/list_files.py
@@ -72,7 +72,7 @@ class List_Files(plugins.PluginInterface):
         key = vnode.vol.offset
         added = False
 
-        if not key in loop_vnodes:
+        if key not in loop_vnodes:
             # We can't do anything with a no-name vnode
             v_name = cls._vnode_name(vnode)
             if v_name is None:
@@ -108,7 +108,7 @@ class List_Files(plugins.PluginInterface):
             added = True
 
             parent = cls._get_parent(context, vnode)
-            while parent and not parent in loop_vnodes:
+            while parent and parent not in loop_vnodes:
                 if not cls._walk_vnode(context, parent, loop_vnodes):
                     break