来源于github，自搜可得。
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1-改变当前的工作目录workspace
>>> os.getcwd()
'D:\\python\\pycode\\youtube_recall'
>>> os.chdir("..")
>>> os.getcwd()
'D:\\python\\pycode'
很显然两个点表示后退一级，类似于命令行的
cd ..
2-关于数据的解读，其中没有user的feat，不知道为啥？？？
github挂了，500
Processed:
0.010, SQL:
10
