Saving stdout from subprocess.Popen to file, plus writing more stuff to the file

Question

I\'m writing a python script that uses subprocess.Popen to execute two programs (from compiled C code) which each produce stdout. The script gets that output and saves it to

Answer 1

I say just keep it real simple. Pseudo code basic logic:

write your start messages to logA
execute A with output to logA
write your in-between messages to logB
execute B with output to logB
write your final messages to logB
when A & B finish, write content of logB to the end of logA
delete logB