Using JIRA module how to move a issue as subtask in Python

I am using below code:

from jira import JIRA
import sys

options = {'server': '', 'verify': False}
jira = JIRA(options, basic_auth=('', 'Password123'))

child_key = sys.argv[1]
parent_key = sys.argv[2]

issue = jira.issue(child_key)
update_issue = issue.update(issuetype={'name': 'Sub Task'}, parent={'key': parent_key})

Open in new window

But when I run it as
python PROJECT-123 PROJECT-100

Open in new window

then I get the below error:
Issue type is a sub-task but parent issue key or id not specified.

Open in new window

Though I am providing the parent key, I would like to know how to fix it?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Phil DavidsonCommented:
Has this ever worked?  If it used to work and no change was made, is there a chance that there is data corruption?

Are you sure the parent_key doesn't need quotes?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
beer9Author Commented:
parent_key is a variable I have to keep it without quotes
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.