tighten up except - in this context, AttributeError is the only exception

that can be raised - do_help won't be called if arg is not a string

Lib/cmd.py

@@ -214,13 +214,13 @@ def do_help(self, arg):
             # XXX check arg syntax
             try:
                 func = getattr(self, 'help_' + arg)
-            except:
+            except AttributeError:
                 try:
                     doc=getattr(self, 'do_' + arg).__doc__
                     if doc:
                         print doc
                         return
-                except:
+                except AttributeError:
                     pass
                 print self.nohelp % (arg,)
                 return