[英]Pandas pivot table with very large number of columns
I have a pandas dataframe df
with about 1000 rows but 500 columns. 我有大约1000行但500列的pandas dataframe
df
。 The columns are named Run1, Run2, ..., Run500 这些列名为Run1,Run2,...,Run500
The existing index is datetime
. 现有索引为
datetime
。
Sample data from dataframe is as follows: 来自数据帧的样本数据如下:
df.ix[1:4,1:4]
Run1 Run2 Date
2019-04-01 01:00:00 23.0263 23.0263 2019-04-01
2019-04-01 01:00:00 19.2212 19.2212 2019-04-01
2019-04-02 01:00:00 19.3694 19.3694 2019-04-02
2019-04-02 01:00:00 19.3694 19.3694 2019-04-02
I can do the trying the following: 我可以尝试以下操作:
pd.pivot_table(df, index=['Date'], values=['Run1'], aggfunc=[np.mean])['mean']
But I need to the following: 但是我需要以下几点:
import pandas as pd
import numpy as np
pd.pivot_table(df, index=['Date'], values=['Run1', 'Run2', ...., 'Run500'], aggfunc=[np.mean])['mean']
我认为这是groupby
+的mean
df.groupby('Date').mean()
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