os.execvp()'ing an ssh command on windows

[Kevin Smith]

I have a tool that invokes a command on a remote machine using ssh
(cygwin) on Windows. Typing the command at a command prompt works
fine. I get prompted to verify the host and asked for a password. If
I try the same command under python using an os.execvp(), things get
screwy. I get prompted to verify the host and for a password, but I
can't type them in. It's as if the command prompt has taken control
again. Is there any way to exec an interactive program such as ssh?

Kevin Smith