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tiny-fisher / tiny-fisher.github.io

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python pandas #3

Open tiny-fisher opened 5 years ago

tiny-fisher commented 5 years ago

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.html

df2 = pd.DataFrame(np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), columns=['a', 'b', 'c'])

tiny-fisher commented 5 years ago

as for 聚合操作， axis = 0 意味着，对行操作，操作之后，行这一个维度就没有了，，，从样本数量降到了1维。