This script will take the labels from one GitHub repository's Issues and sync all of your other repos' Issues with them. After running, all of your repos will have the exact same set of Issues labels. It assumes that every repo has Issues enabled.

duplicate_labels.py

#!/usr/bin/python
#
# This script will take the labels from one GitHub repository's
# Issues and sync all of your other repos' Issues with them. After
# running, all of your repos will have the exact same set of Issue
# labels. It assumes that every repo has Issues enabled.
#
# REQUIREMENTS: needs the 'requests' library, available from pip
#
# Config variables:
#   source_repo_name:   the repository that has the labels you want copied
#   username/password:  your personal GitHub credentials
#   company:            Set this if you're doing it for an Organization.
#                       Leave blank if just for your personal account.

### CONFIG
source_repo_name = 'dashboard'
username = 'USERNAME'
password = 'SECRET'
company = ''
####

import json
import requests

api = "https://api.github.com/"
credentials = (username, password)

if company:
    owner = company
    repos_raw = requests.get(api+"orgs/"+company+"/repos",
                             auth=credentials,
                             params={"type":"owner"})
else:
    owner = username
    repos_raw = requests.get(api+"user/repos",
                             auth=credentials,
                             params={"type":"owner"})
repos = repos_raw.json()
desired_labels = []

def main():
    exclude_source_repo()
    set_desired_labels()
    print_desired_labels()
    delete_old_labels()
    add_desired_labels_to_repos()

def exclude_source_repo():
    for index, repo in enumerate(repos):
        if repo['name'] == source_repo_name:
            repos.pop(index)

def set_desired_labels():
    desired_labels[:] = [{"name": label['name'],
                          "color": label['color']} for label in get_labels_for(source_repo_name)]

def get_labels_for(repo_name):
    labels_raw = requests.get(api+"repos/"+owner+"/"+repo_name+"/labels", auth=credentials)
    return labels_raw.json()

def print_desired_labels():
    print "Using this label set from {0}:".format(source_repo_name)
    print '\n'.join([label['name'] for label in desired_labels])

def delete_old_labels():
    for repo in repos:
        name = repo['name']
        print "Deleting labels from {0} repo".format(name)
        for label in get_labels_for(name):
            url = label['url']
            requests.delete(url, auth=credentials)

def add_desired_labels_to_repos():
    for repo in repos:
        name = repo['name']
        print "Adding new labels to {0} repo".format(name)
        for label in desired_labels:
            requests.post(api+"repos/"+owner+"/"+name+"/labels",
                          auth=credentials,
                          data=json.dumps(label))

if __name__ == "__main__":
    main()