问题描述
我正在尝试将输入数据帧转换为输出数据帧，但是代码无法正常工作，不确定我在哪里丢失了。
我尝试过的事情：
-
我尝试使用pandas.pivot（index，column，values）函数，但是它 向我显示错误，不确定我在哪里失踪。我也试过玩 在上面的命令中与索引有关，但仍然有点正确 回答。我也尝试使用melt命令来到达输出数据帧 但这确实有用。
Input.melt（id_vars ='MeasurementDate'，var_name = ['UID']，value_name = ['Value']）
输入数据框：
Input=pd.DataFrame({'MeasurementDate':['22-07-2020','23-07-2020','24-07-2020','25-07-2020','26-07-2020','27-07-2020','28-07-2020'
],'U1':['V1.1','V1.2','V1.3','V1.4','V1.5','V1.6','V1.7'
],'U2':['V2.1','V2.2','V2.3','V2.4','V2.5','V2.6','V2.7'
],'Forecast_Generation_Date':[
'22-09-2020','23-09-2020','24-09-2020','25-09-2020','26-09-2020','27-09-2020','28-09-2020'
]} )
print(Input)
输出数据框：
Output=pd.DataFrame({'MeasurementDate':['22-07-2020','28-07-2020','22-07-2020','UID':['U1','U1','U2','U2'
],'Value':['V1.1','V1.7','V2.1','V2.7'],'Forecast_Generation_Date':['22-09-2020','28-09-2020','22-09-2020','28-09-2020'
]} )
print(Output)
解决方法
您没有传递df=pd.DataFrame({'MeasurementDate':['22-07-2020','23-07-2020','24-07-2020','25-07-2020','26-07-2020','27-07-2020','28-07-2020'],'U1':['V1.1','V1.2','V1.3','V1.4','V1.5','V1.6','V1.7'],'U2':['V2.1','V2.2','V2.3','V2.4','V2.5','V2.6','V2.7'],'Forecast_Generation_Date':['22-09-2020','23-09-2020','24-09-2020','25-09-2020','26-09-2020','27-09-2020','28-09-2020']
} )
df = df.melt(id_vars=['MeasurementDate','Forecast_Generation_Date'],value_vars=['U1','U2'],var_name='UID')
df
参数。
+-------------------+----------------------------+-------+---------+
| MeasurementDate | Forecast_Generation_Date | UID | value |
+===================+============================+=======+=========+
| 22-07-2020 | 22-09-2020 | U1 | V1.1 |
| 23-07-2020 | 23-09-2020 | U1 | V1.2 |
| 24-07-2020 | 24-09-2020 | U1 | V1.3 |
| 25-07-2020 | 25-09-2020 | U1 | V1.4 |
| 26-07-2020 | 26-09-2020 | U1 | V1.5 |
| 27-07-2020 | 27-09-2020 | U1 | V1.6 |
| 28-07-2020 | 28-09-2020 | U1 | V1.7 |
| 22-07-2020 | 22-09-2020 | U2 | V2.1 |
| 23-07-2020 | 23-09-2020 | U2 | V2.2 |
| 24-07-2020 | 24-09-2020 | U2 | V2.3 |
| 25-07-2020 | 25-09-2020 | U2 | V2.4 |
| 26-07-2020 | 26-09-2020 | U2 | V2.5 |
| 27-07-2020 | 27-09-2020 | U2 | V2.6 |
| 28-07-2020 | 28-09-2020 | U2 | V2.7 |
+-------------------+----------------------------+-------+---------+
输出
Post