How to update job config files using the Python API?

Issue

I would like to be able to update job config files remotely using the Jenkins Python API.

Environment

CloudBees Jenkins Enterprise
Remote Access API
JenkinsAPI

Resolution

Here is an example that replaces occurrences of oldvalue with newvalue in job test.

#!/usr/bin/python

from jenkinsapi.jenkins import Jenkins

if __name__ == '__main__':
        jenkins = 'https://localhost:8080/'
        server = Jenkins(jenkins, username = 'admin', password = 'admin')
        job = server.get_job('test')
        config=job.get_config()
        new = config.replace('oldvalue', 'newvalue')
        job.update_config(new)

Obviously, replace:

username = 'admin', password = 'admin' with your username and password
https://localhost:8080/ with your Jenkins URL
test with your job name

See Remote Access API and JenkinsAPI for more.