subprocess.Popen for lively data reading?

[Skaperen]

is subprocess.Popen the best choice for lively data reading? what i mean by lively data reading is that i can read the data immediately after the kernel makes it available from the child process that was start in that call writes it out to the kernel, instead of waiting for the child process to exit/end and get all of the output all at one. think of reading the output of the ping command.