我用pip安装flower模块，为什么会自动帮我下载安装好多其他的模块，如下：
Successfully installed flower celery tornado babel pytz futures kombu billiard backports.ssl-match-hostname certifi anyjson amqp
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It should be dependence
flower depends on these packages and must be downloaded first, otherwise it will not run. Flower manages celery and provides web page visual management. If the related celery/kombu/amqp/tornado is not available locally, it will be downloaded.
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It should be dependence
flower depends on these packages and must be downloaded first, otherwise it will not run.
Flower manages celery and provides web page visual management. If the related celery/kombu/amqp/tornado is not available locally, it will be downloaded.