Index: Lib/pdb.py
===================================================================
--- Lib/pdb.py	(wersja 47028)
+++ Lib/pdb.py	(kopia robocza)
@@ -1119,6 +1119,9 @@
 # Simplified interface
 
 def run(statement, globals=None, locals=None):
+    if not isinstance(statement, str):
+        print 'The first argument must be a string'
+        return
     Pdb().run(statement, globals, locals)
 
 def runeval(expression, globals=None, locals=None):