Remove unused GitLab Labels

remove_unused_gitlab_labels.py

# remove_unused_gitlab_labels.py
import requests 
from requests.auth import HTTPBasicAuth
import uuid
import json

# *False* if Jira / GitLab is using self-signed certificates, otherwhise *True*
VERIFY_SSL_CERTIFICATE = True

## GitLab specifics
# GitLab URL
GITLAB_URL = 'https://gitlab.com/'
# GitLab token will be used whenever the API is invoked
GITLAB_TOKEN = 'your-private-gitlab-token'
# Gitlab project with group/namespace
GITLAB_PROJECT = 'your-group-name/your-project-name'
# GitLab project id.
GITLAB_PROJECT_ID = 'your-group-id'

if not GITLAB_PROJECT_ID:
    # Find out the ID of the project.
    for project in requests.get(
        GITLAB_URL + 'api/v4/projects',
        headers={'PRIVATE-TOKEN': GITLAB_TOKEN},
        verify=VERIFY_SSL_CERTIFICATE
    ).json():
        if project['path_with_namespace'] == GITLAB_PROJECT:
            GITLAB_PROJECT_ID = project['id']
            break

if not GITLAB_PROJECT_ID:
    raise Exception("Unable to find %s in GitLab!" % GITLAB_PROJECT)

gl_labels=[]
def get_labels(next_page):
    response = requests.get(
        GITLAB_URL + 'api/v4/projects/%s/labels?with_counts=true&per_page=100&page=%s' % (GITLAB_PROJECT_ID, next_page),
        headers={'PRIVATE-TOKEN': GITLAB_TOKEN},
        verify=VERIFY_SSL_CERTIFICATE
    )

    if response.status_code != 200:
        raise Exception("Unable to get project labels for  %s!" % GITLAB_PROJECT)

    for label in response.json():
        label_id = label['id']
        label_name = label['name']
        open_issues = label['open_issues_count']
        closed_issues = label['closed_issues_count']
        merged_issues =label['open_merge_requests_count']
        
        if open_issues == 0 and closed_issues == 0 and merged_issues == 0:
            gl_labels.append({ 'id': label_id, 'name': label_name })

    next_page = response.headers.get('X-Next-Page')
    current_page = response.headers.get('X-Page')

    if current_page < next_page:
        get_labels(next_page)

    return gl_labels

labels = get_labels(1)

for label in labels:
    print("Try to delete label: %s (%s)" % (label['id'], label['name']))

    response = requests.delete(
        GITLAB_URL + 'api/v4/projects/%s/labels/%s' % (GITLAB_PROJECT_ID, label['id']),
        headers={'PRIVATE-TOKEN': GITLAB_TOKEN},
        verify=VERIFY_SSL_CERTIFICATE
    )

    if response.status_code == 200:
        print("Label: %s (%s) deleted!" % (label['id'], label['name']))

Thank you, still works using python3 :-)