diff --git a/direct/src/particles/ParticleEffect.py b/direct/src/particles/ParticleEffect.py
index 82f0904715..bfb15d714f 100644
--- a/direct/src/particles/ParticleEffect.py
+++ b/direct/src/particles/ParticleEffect.py
@@ -1,7 +1,5 @@
-
-from panda3d.core import *
-
 # Leave these imports in, they may be used by ptf files.
+from panda3d.core import *
 from panda3d.physics import *
 from . import Particles
 from . import ForceGroup
diff --git a/direct/src/showbase/PythonUtil.py b/direct/src/showbase/PythonUtil.py
index ea08247823..58d3ce3f14 100644
--- a/direct/src/showbase/PythonUtil.py
+++ b/direct/src/showbase/PythonUtil.py
@@ -1827,7 +1827,7 @@ class DelayedCall:
         self._removeDoLater()
     def finish(self):
         if not self._finished:
-            self._doCallback()
+            self._doCallback(None)
         self.destroy()
     def _addDoLater(self):
         taskMgr.doMethodLater(self._delay, self._doCallback, self._taskName)
diff --git a/direct/src/showbase/TaskThreaded.py b/direct/src/showbase/TaskThreaded.py
index a6634cd751..279c224a21 100755
--- a/direct/src/showbase/TaskThreaded.py
+++ b/direct/src/showbase/TaskThreaded.py
@@ -44,7 +44,8 @@ class TaskThreaded:
         self.ignoreAll()
 
     def getTimeslice(self):
-        return self.___timeslice
+        return self.__timeslice
+
     def setTimeslice(self, timeslice):
         self.__timeslice = timeslice
 
diff --git a/direct/src/tkpanels/Inspector.py b/direct/src/tkpanels/Inspector.py
index ddbbe30dc1..70f67fa2bc 100644
--- a/direct/src/tkpanels/Inspector.py
+++ b/direct/src/tkpanels/Inspector.py
@@ -219,7 +219,7 @@ class SequenceInspector(Inspector):
         if partNumber == 0:
             return self.object
         index = self.privatePartNumber(partNumber)
-        if type(index) == IntType:
+        if isinstance(index, int):
             return self.object[index]
         else:
             return getattr(self.object, index)