Python| Pandas.pivot_table()

pandas.pivot_table(data, values=None, index=None, columns=None, aggfunc='mean', fill_value=None, margins=False, dropna=True, margins_name='All')创建一个电子表格样式的数据透视表为一个数据框。

数据透视表中的级别将存储在结果 DataFrame 的索引和列上的 MultiIndex 对象（分层索引）中。

Parameters:

data : DataFrame
values : column to aggregate, optional
index: column, Grouper, array, or list of the previous
columns: column, Grouper, array, or list of the previous

aggfunc: function, list of functions, dict, default numpy.mean
-> If list of functions passed, the resulting pivot table will have hierarchical columns whose top level are the function names.
-> If dict is passed, the key is column to aggregate and value is function or list of functions

fill_value[scalar, default None] : Value to replace missing values with
margins[boolean, default False] : Add all row / columns (e.g. for subtotal / grand totals)
dropna[boolean, default True] : Do not include columns whose entries are all NaN
margins_name[string, default ‘All’] : Name of the row / column that will contain the totals when margins is True.

Returns: DataFrame

代码：

# Create a simple dataframe
   
# importing pandas as pd
import pandas as pd
import numpy as np
   
# creating a dataframe
df = pd.DataFrame({'A': ['John', 'Boby', 'Mina', 'Peter', 'Nicky'],
      'B': ['Masters', 'Graduate', 'Graduate', 'Masters', 'Graduate'],
      'C': [27, 23, 21, 23, 24]})
   
df

# Simplest pivot table must have a dataframe
# and an index/list of index.
table = pd.pivot_table(df, index =['A', 'B'])
  
table

# Creates a pivot table dataframe
table = pd.pivot_table(df, values ='A', index =['B', 'C'],
                         columns =['B'], aggfunc = np.sum)
  
table