diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index 1f980149de..c0dddcf174 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -153,7 +153,7 @@ do_fetch[vardeps] += "SRCREV"
 python base_do_fetch() {
 
     src_uri = (d.getVar('SRC_URI') or "").split()
-    if len(src_uri) == 0:
+    if not src_uri:
         return
 
     try:
@@ -170,7 +170,7 @@ do_unpack[cleandirs] = "${@d.getVar('S') if os.path.normpath(d.getVar('S')) != o
 
 python base_do_unpack() {
     src_uri = (d.getVar('SRC_URI') or "").split()
-    if len(src_uri) == 0:
+    if not src_uri:
         return
 
     try:
@@ -693,7 +693,7 @@ python () {
             if os.path.basename(p) == machine and os.path.isdir(p):
                 paths.append(p)
 
-        if len(paths) != 0:
+        if paths:
             for s in srcuri.split():
                 if not s.startswith("file://"):
                     continue
@@ -726,7 +726,7 @@ do_cleansstate[nostamp] = "1"
 
 python do_cleanall() {
     src_uri = (d.getVar('SRC_URI') or "").split()
-    if len(src_uri) == 0:
+    if not src_uri:
         return
 
     try: