重塑 pandas 数据框，使列中的项目成为新的列标题？

Question

我的数据文件必须在列中才能导出到 excel 因为它的大小，因此当我想在 python 中再次使用它时我必须转置它。我想旋转数据框。如何将左列中的项目设为新数据框的列标题？

import numpy as np
#example 
example_raw = [["Date", "11/19/20","12/22/20","2/17/21","2/19/21"],
       ["Time","9:40:28","9:25:13","9:20:17","9:19:58"],
       ["ID", 101, 102, 206, 104], 
             ["timestamp", "09:40:28:590","09:25:13:437","09:20:17:455","09:19:58:629"], 
             ["SECOND", np.NaN, np.NaN, np.NaN, np.NaN],
             [0, 4.69, 4.1, 7.17, 8.66],
              [0.2, 4.67, 4.16, 7.17, 8.74],
              [0.4, 4.66, 4.21, 7.17, 8.75],
              [0.6, 4.66, 4.21, 7.17, 8.75],
              [0.8, 4.64, 4.28, 7.16, 8.75]]
example_table = pd.DataFrame(example_raw,columns=["Unnamed: 0", "CURRENT","CURRENT.1", "CURRENT.2", "CURRENT.3"])

#Desired outcome
desired=[["11/19/20","9:40:28","101", "09:40:28:590",4.69,4.67,4.66,4.66, 4.64],
         ["12/22/20","9:25:13","102", "09:25:13:437",4.1,4.16,4.21,4.21, 4.28],
         ["2/17/21","9:20:17","206", "9:20:17:455",7.17,7.17,7.17,7.17,7.18]
        ]

desired_table = pd.DataFrame(desired,columns=["Date","Time", "ID","timestamp", "0","0.2","0.4","0.6","0.8"])```




This question response would be applicable if the seconds data was not in the way. 
It gets me close, but not quite there. 
```new_table_1 = example_table.set_index([example_table['Unnamed: 0'],example_table.groupby('Unnamed: 0').cumcount()]).drop('Unnamed: 0',1).unstack(1)```

Answer 1

你可以试试：

df_result = example_table.dropna().T
df_result.columns = df_result.iloc[0]
df_result = df_result.iloc[1:].rename_axis(None, axis=1).reset_index(drop=True)

结果：

print(df_result)

       Date     Time   ID     timestamp     0   0.2   0.4   0.6   0.8
0  11/19/20  9:40:28  101  09:40:28:590  4.69  4.67  4.66  4.66  4.64
1  12/22/20  9:25:13  102  09:25:13:437   4.1  4.16  4.21  4.21  4.28
2   2/17/21  9:20:17  206  09:20:17:455  7.17  7.17  7.17  7.17  7.16
3   2/19/21  9:19:58  104  09:19:58:629  8.66  8.74  8.75  8.75  8.75

重塑 pandas 数据框，使列中的项目成为新的列标题？

Reshape a pandas dataframe so that items in a column are new column titles?

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