old_contents: from scrapy.command import ScrapyCommand
  from scrapy.utils.conf import arglist_to_dict
  from scrapy.exceptions import UsageError
  
  
  class Command(ScrapyCommand):
  
      requires_project = True
  
      def syntax(self):
          return "[options] <spider>"
  
      def short_desc(self):
          return "Run a spider"
  
      def add_options(self, parser):
          ScrapyCommand.add_options(self, parser)
          parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
                            help="set spider argument (may be repeated)")
          parser.add_option("-o", "--output", metavar="FILE",
                            help="dump scraped items into FILE (use - for stdout)")
          parser.add_option("-t", "--output-format", metavar="FORMAT",
                            help="format to use for dumping items with -o")
  
      def process_options(self, args, opts):
          ScrapyCommand.process_options(self, args, opts)
          try:
              opts.spargs = arglist_to_dict(opts.spargs)
          except ValueError:
              raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
          if opts.output:
              if opts.output == '-':
                  self.settings.overrides['FEED_URI'] = 'stdout:'
              else:
                  self.settings.overrides['FEED_URI'] = opts.output
              valid_output_formats = self.settings['FEED_EXPORTERS'].keys() + self.settings['FEED_EXPORTERS_BASE'].keys()
              if not opts.output_format:
                  opts.output_format = os.path.splitext(opts.output)[1].replace(".", "")
              if opts.output_format not in valid_output_formats:
                  raise UsageError('Invalid/unrecognized output format: %s, Expected %s' % (opts.output_format, valid_output_formats))
              self.settings.overrides['FEED_FORMAT'] = opts.output_format
  
      def run(self, args, opts):
          if len(args) < 1:
              raise UsageError()
          elif len(args) > 1:
              raise UsageError("running 'scrapy crawl' with more than one spider is no longer supported")
          spname = args[0]
  
          crawler = self.crawler_process.create_crawler()
          spider = crawler.spiders.create(spname, **opts.spargs)
          crawler.crawl(spider)
          self.crawler_process.start()
  
new_contents: import os
  from scrapy.command import ScrapyCommand
  from scrapy.utils.conf import arglist_to_dict
  from scrapy.exceptions import UsageError
  
  
  class Command(ScrapyCommand):
  
      requires_project = True
  
      def syntax(self):
          return "[options] <spider>"
  
      def short_desc(self):
          return "Run a spider"
  
      def add_options(self, parser):
          ScrapyCommand.add_options(self, parser)
          parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
                            help="set spider argument (may be repeated)")
          parser.add_option("-o", "--output", metavar="FILE",
                            help="dump scraped items into FILE (use - for stdout)")
          parser.add_option("-t", "--output-format", metavar="FORMAT",
                            help="format to use for dumping items with -o")
  
      def process_options(self, args, opts):
          ScrapyCommand.process_options(self, args, opts)
          try:
              opts.spargs = arglist_to_dict(opts.spargs)
          except ValueError:
              raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
          if opts.output:
              if opts.output == '-':
                  self.settings.overrides['FEED_URI'] = 'stdout:'
              else:
                  self.settings.overrides['FEED_URI'] = opts.output
              valid_output_formats = self.settings['FEED_EXPORTERS'].keys() + self.settings['FEED_EXPORTERS_BASE'].keys()
              if not opts.output_format:
                  opts.output_format = os.path.splitext(opts.output)[1].replace(".", "")
              if opts.output_format not in valid_output_formats:
                  raise UsageError('Invalid/unrecognized output format: %s, Expected %s' % (opts.output_format, valid_output_formats))
              self.settings.overrides['FEED_FORMAT'] = opts.output_format
  
      def run(self, args, opts):
          if len(args) < 1:
              raise UsageError()
          elif len(args) > 1:
              raise UsageError("running 'scrapy crawl' with more than one spider is no longer supported")
          spname = args[0]
  
          crawler = self.crawler_process.create_crawler()
          spider = crawler.spiders.create(spname, **opts.spargs)
          crawler.crawl(spider)
          self.crawler_process.start()
  
subject: Add import os for crawl.