Question

I need to be pointed in the right direction for this problem I’m working on:

Let’s say I’m reading output from a C program as follows:

while True:
    ln = p.stdout.readline()
    if '' == ln:
        break
    #do stuff here with ln

And my output looks like this line for line:

TrnIq: Thread on CPU 37
TrnIq: Thread on CPU 37 but will be moved to CPU 44
IP-Thread on CPU 33
FANOUT Thread on CPU 37
Filter-Thread on CPU 38 but will be moved to CPU 51
TRN TMR Test 2 Supervisor Thread on CPU 34
HomographyWarp Traking Thread[0] on CPU 26

I want to capture “TrnIq: Thread on” and “37” as 2 separate variables: a string and a number from output “TrnIq: Thread on CPU 37”.

Its pretty well the same for the other lines to, for example capture “HomographyWarp Traking Thread[0] on” and the # “26” from “HomographyWarp Traking Thread[0] on CPU 26”.

The only real challenge is for lines like this: “Filter-Thread on CPU 38 but will be moved to CPU 51” on this line I need “Filer-Thread” and the # “51” not the first # “38”.

Python has so many different ways to do this I dont even know where to start!

Thanks in advance!

Answer 1

regex seems like overkill to me here. [Disclaimer: I don’t like regular expressions, but do like Python, so where possible I write in Python, and don’t write regular expressions. For reasons I’ve never fully understood this is considered surprising.]

s = """TrnIq: Thread on CPU 37
TrnIq: Thread on CPU 37 but will be moved to CPU 44
IP-Thread on CPU 33
FANOUT Thread on CPU 37
Filter-Thread on CPU 38 but will be moved to CPU 51
TRN TMR Test 2 Supervisor Thread on CPU 34
HomographyWarp Traking Thread[0] on CPU 26"""

for line in s.splitlines():
    words = line.split()
    if not ("CPU" in words and "on" in words): continue # skip uninteresting lines
    prefix_words = words[:words.index("on")+1]
    prefix = ' '.join(prefix_words)
    cpu = int(words[-1])
    print (prefix, cpu)

gives

('TrnIq: Thread on', 37)
('TrnIq: Thread on', 44)
('IP-Thread on', 33)
('FANOUT Thread on', 37)
('Filter-Thread on', 51)
('TRN TMR Test 2 Supervisor Thread on', 34)
('HomographyWarp Traking Thread[0] on', 26)

and I don’t think I need to translate any of this code into English.