新手小白学习到 dir （）函数这里，在 pycharm 里运行，没有返回模块名称，哪位小伙伴告知下原因？
import sys
dir(sys)
运行结果窗口只显示 ：Process finished with exit code 0
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xuegj1010 Jul 5, 2018  1
print(dir(sys))
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