Log Message:
py-pexpect: updated to 4.4.0

Version 4.4
PopenSpawn now has a preexec_fn parameter, like spawn and subprocess.Popen, for \ 
a function to be called in the child process before executing the new command. \ 
Like in Popen, this works only in POSIX, and can cause issues if your \ 
application also uses threads.
Significant performance improvements when processing large amounts of data.
Ensure that spawn.closed gets set by close(), and improve an example for passing \ 
SIGWINCH through to a child process