(Backport.)

Fix SF bug 579701 (Fernando Pérez); an input line consisting of one or
more spaces only crashed pdb.

diff --git a/Lib/pdb.py b/Lib/pdb.py
index 1286f122ba0d3e523a090ad38ce7e547b721585b..7ff994d14b08e7ac64e3658a630fb1b0b5c0db76 100755 (executable)
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -151,7 +151,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 
     def precmd(self, line):
         """Handle alias expansion and ';;' separator."""
-        if not line:
+        if not line.strip():
             return line
         args = line.split()
         while self.aliases.has_key(args[0]):