一维数据VS只有一行二维数据

DataFrame.values 操作细节

DataFrame.values 获取键值values加.[:,0]的 差别

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import pandas as pd
df =pd.DataFrame(range(5))
df

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print(df.iloc[:,0:1].values.shape)
print(df.values)

(5, 1)
[[0]
[1]
[2]
[3]
[4]]

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print(df.iloc[:,0:1].values[:, 0].shape)
print(df.values[:, 0])

(5,)
[0 1 2 3 4]