import osfrom scrapy.commands import ScrapyCommandfrom scrapy.utils.conf import arglist_to_dictfrom scrapy.utils.python import without_none_valuesfrom scrapy.exceptions import UsageErrorclass Command(ScrapyCommand):    requires_project = True    def syntax(self):        return "[options] 
     
      "　　# 这里修改一点    def short_desc(self):        return "Run all 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.set('FEED_URI', 'stdout:', priority='cmdline')            else:                self.settings.set('FEED_URI', opts.output, priority='cmdline')            feed_exporters = without_none_values(                self.settings.getwithbase('FEED_EXPORTERS'))            valid_output_formats = feed_exporters.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("Unrecognized output format '%s', set one"                                 " using the '-t' switch or as a file extension"                                 " from the supported list %s" % (opts.output_format,                                                                  tuple(valid_output_formats)))            self.settings.set('FEED_FORMAT', opts.output_format, priority='cmdline')    #关键是这里    def run(self, args, opts):        # 获取爬虫列表        spd_loder_list = self.crawler_process.spider_loader.list()        # 遍历各爬虫        for spname in spd_loder_list or args:            self.crawler_process.crawl(spname,**opts.spargs)            print('此时启动的爬虫为：'+spname)        self.crawler_process.start()
     

放入项目目录，配置setting.py

COMMANDS_MODULE = 'mypjt.mycommand' scrapy mycommand --nolog