how to get python print result in jenkins console output

Question

I have a Python script print strings. Now when run it in Jenkins I didn't see the printed strings in Jenkins Builds' Console Output.

Anyway to achieve that?

See http://stackoverflow.com/questions/11631951/jenkins-console-output-not-in-realtime — Federico, Apr 04 '16 at 08:11

score 19 · Accepted Answer · answered Jul 25 '18 at 17:58

19

Try using -u (unbuffered) option when running the python script.

python -u my_script.py

answered Jul 25 '18 at 17:58

gh0st

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score 5 · Answer 2 · answered Apr 03 '14 at 14:11

5

Any output to stdout from a process spawned by Jenkins should be captured by Console Output. One caveat is that it won't be displayed until a newline character is printed, so make sure your lines are terminated.

If you are launching python in some weird way that dis-associates it from Jenkins parent process, then I can't help you.

answered Apr 03 '14 at 14:11

Slav

27,057
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Thanks. It solves my problem. I used `sys.stdout.write('\r foo bar')` and `sys.stdout.flush()` to print the logs of a loop on the same line. It works as expected in my console. But in jenkins console output, the logs don't show until all are done. Now I test the value of the environmental variable `BUILD_NUMBER` to use `sys.stdout.write` or just `print`. – ElpieKay Jan 25 '22 at 14:05

score 2 · Answer 3 · answered Aug 20 '14 at 01:14

2

I believe that what you need to do is a flush, try:

import sys
sys.stdout.flush()

It should help.

answered Aug 20 '14 at 01:14

Suryavanshi

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score 0 · Answer 4 · answered Jan 23 '23 at 14:17

The accepted answer got me on the right track, however in my case, a shell script that Jenkins was running was capturing the output of the python script in a subshell to a variable i.e. a=$(python_script), so it was not being echoed....

To solve the problem I just had to log to stderr instead of stdout, i.e.

import sys
sys.stderr.write("my info\n")
sys.stdout.flush()

how to get python print result in jenkins console output

4 Answers4