This simple package allows for communication with subprocesses much like pexpect (https://pexpect.readthedocs.org/en/latest/) but it does not have the dreaded 1024 char limit for sending input to the process (http://stackoverflow.com/questions/9218499/pexpect-cant-pass-input-over-1024-chars). This is an alpha that I hacked together in a couple of hours to go around the issue described above. Right now, it just supports sendline and expect. The rest of the functionality can be added relatively easily.
from tprocess import tprocess
cmd = ... # some process command as it would be run on the shell
proc = tprocess(cmd)
proc.expect( ">", timeout = None ) # timeout is not implemented yet.
print(proc.before) # to get the text from the subprocess stdout (and stderr)
You can clone the project from GitHub or use pip.
pip3 install git+http://github.com/tayyabt/tprocess