added _doc.py -- doc-string ckecking utility

added some sample description

samples/python2/_doc.py

@@ -0,0 +1,14 @@
+'''
+Scans current directory for *.py files and reports
+ones with missing __doc__ string.
+'''
+
+from glob import glob
+
+if __name__ == '__main__':
+    print '--- undocumented files:'
+    for fn in glob('*.py'):
+        loc = {}
+        execfile(fn, loc)
+        if '__doc__' not in loc:
+            print fn