diff --git a/tools/check_sources.py b/tools/check_sources.py
new file mode 100755
index 0000000..3acd2bc
--- /dev/null
+++ b/tools/check_sources.py
@@ -0,0 +1,15 @@
+from path import path
+fs = path('..').walkfiles('*.py')
+
+for f in fs:
+    errs = ''
+    cont = f.bytes()
+    if '\t' in cont:
+        errs+='t'
+
+    if '\r' in cont:
+        errs+='r'
+        
+    if errs:
+        print "%3s" % errs, f
+    
\ No newline at end of file