Python jira - issue.fields.status

I am trying to print all issues with the status Done however, nothing is returning after the if issue.fields.status == 'Done' even though there is one issue which is Done.

#!/usr/bin/python
import.jira.client
from jira.client import JIRA

projects = jira.project()
for project in projects:
    issues = jira.search_issues('project=OK')

for issue in issues:
    print issue.fields.status
    if issue.fields.status == 'Done':
        print issue

Result:

test@test~:$ ./ok.py
Backlog
Done

I have also tried: if 'Done' in issue.fields.status: that didn't either work.