Real-time intercepting of stdout from another process in Python

Question

I\'d like to run a system process, intercept the output, and modify it real-time, line by line, in a Python script.

My best attempt, which waits for the process to c

Answer 1

This whole thing can be encapsulated in an iterator as:

def subprocess_readlines(out):
    while True:
        line = out.readline()
        if not line:
            return
        yield line

And called as:

for line in subprocess_readlines(proc.stdout):
    print ">>>", line.rstrip()