Add usage message when no arguments.

Author: gvanrossum

Lib/tabnanny.py

@@ -19,9 +19,13 @@ def main():
         opts, args = getopt.getopt(sys.argv[1:], "v")
     except getopt.error, msg:
         print msg
+        return
     for o, a in opts:
         if o == '-v':
             verbose = verbose + 1
+    if not args:
+        print "Usage:", sys.argv[0], "file_or_directory ..."
+        return
     for arg in args:
         check(arg)
 

Tools/idle/tabnanny.py

@@ -19,9 +19,13 @@ def main():
         opts, args = getopt.getopt(sys.argv[1:], "v")
     except getopt.error, msg:
         print msg
+        return
     for o, a in opts:
         if o == '-v':
             verbose = verbose + 1
+    if not args:
+        print "Usage:", sys.argv[0], "file_or_directory ..."
+        return
     for arg in args:
         check(arg)
 

Tools/scripts/tabnanny.py

@@ -19,9 +19,13 @@ def main():
         opts, args = getopt.getopt(sys.argv[1:], "v")
     except getopt.error, msg:
         print msg
+        return
     for o, a in opts:
         if o == '-v':
             verbose = verbose + 1
+    if not args:
+        print "Usage:", sys.argv[0], "file_or_directory ..."
+        return
     for arg in args:
         check(arg)
 

Tools/scripts/tabpolice.py

@@ -16,13 +16,17 @@ def main():
 		opts, args = getopt.getopt(sys.argv[1:], "qv")
 	except getopt.error, msg:
 		print msg
+		return
 	for o, a in opts:
 		if o == '-v':
 			verbose = verbose + 1
 			quiet = 0
 		if o == '-q':
 			quiet = 1
 			verbose = 0
+	if not args:
+		print "Usage:", sys.argv[0], "file_or_directory ..."
+		return
 	for arg in args:
 		check(arg)