熊猫-Python中一列的累计和

原文:https://www . geesforgeks . org/累计-熊猫一栏之和-python/

使用预定义的函数 cumsum() ，可以很容易地计算 Pandas 中一列的累计和。

语法: cumsum(轴=无，skipna =真，args， * kwargs) 参数: 轴: {index (0)，columns (1)} skipna: 排除 NA/null 值。如果整行/整列为 NA，则结果为 NA 返回:*该列的累计和

例 1:

Python 3

import pandas as pd
import numpy as np

# Create a dataframe
df1 = pd.DataFrame({"A":[2, 3, 8, 14], 
                   "B":[1, 2, 4, 3], 
                   "C":[5, 3, 9,2]}) 

# Computing sum over Index axis
print(df1.cumsum(axis = 0))

输出:

    A   B   C
0   2   1   5
1   5   3   8
2  13   7  17
3  27  10  19

例 2:

Python 3

import pandas as pd
import numpy as np

# Create a dataframe
df1 = pd.DataFrame({"A":[None, 3, 8, 14], 
                   "B":[1, None, 4, 3], 
                   "C":[5, 3, 9,None]}) 

# Computing sum over Index axis
print(df1.cumsum(axis = 0, skipna = True))

输出:

      A    B     C
0   NaN  1.0   5.0
1   3.0  NaN   8.0
2  11.0  5.0  17.0
3  25.0  8.0   NaN

例 3:

Python 3

import pandas as pd
import numpy as np

# Create a dataframe
df1 = pd.DataFrame({"A":[2, 3, 8, 14], 
                   "B":[1, 2, 4, 3], 
                   "C":[5, 3, 9,2]}) 

# Computing sum over Index axis
print(df1.cumsum(axis = 1))

输出:

    A   B   C
0   2   3   8
1   3   5   8
2   8  12  21
3  14  17  19

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