old_contents: import csv
  
  from django.core.management.base import BaseCommand, CommandError
  
  from wafer.tickets.views import import_ticket
  
  
  class Command(BaseCommand):
      args = '<csv file>'
      help = "Import a guest list CSV from Quicket"
  
      def handle(self, *args, **options):
          if len(args) != 1:
              raise CommandError('1 CSV File required')
  
          with open(args[0], 'r') as f:
              reader = csv.reader(f)
  
              header = next(reader)
              if len(header) != 11:
                  raise CommandError('CSV format has changed. Update wafer')
  
              for ticket in reader:
                  self.import_ticket(*ticket)
  
      def import_ticket(self, ticket_number, ticket_barcode, purchase_date,
                        ticket_type, ticket_holder, email, cellphone, checked_in,
                        checked_in_date, checked_in_by, complimentary):
          import_ticket(ticket_barcode, ticket_type, email)
  
new_contents: import csv
  
  from django.core.management.base import BaseCommand, CommandError
  
  from wafer.tickets.views import import_ticket
  
  
  class Command(BaseCommand):
      args = '<csv file>'
      help = "Import a guest list CSV from Quicket"
  
      def handle(self, *args, **options):
          if len(args) != 1:
              raise CommandError('1 CSV File required')
  
          columns = ('Ticket Number', 'Ticket Barcode', 'Purchase Date',
                     'Ticket Type', 'Ticket Holder', 'Email', 'Cellphone',
                     'Checked in', 'Checked in date', 'Checked in by',
                     'Complimentary')
          keys = [column.lower().replace(' ', '_') for column in columns]
  
          with open(args[0], 'r') as f:
              reader = csv.reader(f)
  
              header = tuple(next(reader))
              if header != columns:
                  raise CommandError('CSV format has changed. Update wafer')
  
              for row in reader:
                  ticket = dict(zip(keys, row))
                  import_ticket(ticket['ticket_barcode'],
                                ticket['ticket_type'],
                                ticket['email'])
  
subject: Check CSV header, not column count (and refactor)