Error out if not enough parameters are given

sebastinas · sebastinas · commit df00c79914c4 · 2017-05-28T17:27:28.000+02:00
Signed-off-by: Sebastian Ramacher &lt;sebastian+dev@ramacher.at&gt;
diff --git a/bpdb/__init__.py b/bpdb/__init__.py
@@ -78,6 +78,10 @@ def main():
               'See AUTHORS for detail.')
         return 0
 
+    if len(args) < 2:
+        print('usage: bpdb scriptfile [arg] ...')
+        return 2
+
     # The following code is based on Python's pdb.py.
     mainpyfile = args[1]
     if not os.path.exists(mainpyfile):
