Script to add members to your gsuite group using admin directory api.

Addmember.py

# Need credentials.json in root of the script

from __future__ import print_function
from google.oauth2.service_account import Credentials
import googleapiclient.discovery, json, progress.bar, glob, sys, argparse, time
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
import os
import pickle

parse = argparse.ArgumentParser(description='A tool to add any email to your gsuite group')
parsereq = parse.add_argument_group('required arguments')
parsereq.add_argument('--groupaddr', '-g', help='The address of groups for your organization.', required=True)
parsereq.add_argument('--emailaddr', '-e', help='The address of email to be added into the group.', required=True)
parse.add_argument('--credentials', '-c', default='credentials.json', help='Specify the relative path for the controller file.')


args = parse.parse_args()
group = args.groupaddr
mail = args.emailaddr
credentials = glob.glob(args.credentials)
creds = None


if os.path.exists('token.pickle'):
    with open('token.pickle', 'rb') as token:
        creds = pickle.load(token)
if not creds or not creds.valid:
    if creds and creds.expired and creds.refresh_token:
        creds.refresh(Request())
    else:
        flow = InstalledAppFlow.from_client_secrets_file(credentials[0], scopes=[
            'https://www.googleapis.com/auth/admin.directory.group',
            'https://www.googleapis.com/auth/admin.directory.group.member'
        ])
        # creds = flow.run_local_server(port=0)
        creds = flow.run_console()
    # Save the credentials for the next run
    with open('token.pickle', 'wb') as token:
        pickle.dump(creds, token)

def AddMembers(drive, email, groups):
    body = {"email": email, "role": "MEMBER"}
    drive.members().insert(groupKey=groups, body=body).execute()

def main():
    service = googleapiclient.discovery.build("admin", "directory_v1", credentials=creds)
    AddMembers(service, mail, group)
    print("Email successfully added!")

if __name__ == "__main__":
    main()

Inspired from :- Here