new_contents: # -*- coding: utf-8 -*-
  
  from django.core.management.base import BaseCommand
  from open_humans.models import Member
  
  
  class Command(BaseCommand):
      help = 'for plotting user growth'
      args = ''
  
      def handle(self, *args, **options):
          user_number = 1
          members = Member.objects.order_by(
              'user__date_joined').filter(user__is_active=True)
          for member in members:
              print("{}\t{}".format(
                  member.user.date_joined,
                  user_number
              ))
              user_number += 1
  
subject: create user_growth command