When you type a command in pdb that happens to print something, the
output goes to sys.stdout, even if self.stdout references another file.
 This makes it hard to debug code running inside a web server where
sys.stdout/stdout are connected to a socket (or a WSGI wrapper file);
the output "disappears" and ends up messing up the response.

Attached is a fix that temporarily changes sys.stdin/stdout to the
debugger's input and output.  What do people think of this?

Here's an improved patch -- the recursive debugger invocation should
pass the I/O settings on.

Committed revision 59984 (2.6).
Decided not to backport this to 2.5.