Comparision to None should be done with "is" or "is not"

https://www.python.org/dev/peps/pep-0008/#programming-recommendations

build/windows/jhbuild/makepkgs.py

@@ -109,7 +109,7 @@ def main ():
 
     scriptdir_loc = os.path.dirname (os.path.realpath (__file__))
     targets_loc = os.path.join (scriptdir_loc, "targets")
-    if packages_loc == None:
+    if packages_loc is None:
         packages_loc = os.path.join (targets_loc, "packages")
 
     run (targets_loc, packages_loc)

plug-ins/pygimp/plug-ins/whirlpinch.py

@@ -52,7 +52,7 @@ class pixel_fetcher:
                 row = y / self.tile_height
                 rowoff = y % self.tile_height
 
-                if col != self.col or row != self.row or self.tile == None:
+                if col != self.col or row != self.row or self.tile is None:
                         self.tile = self.drawable.get_tile(False, row, col)
                         self.col = col
                         self.row = row