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Sample code for summing rows and columns and adding new rows and columns in pandas.DataFrame in python

高洛峰
高洛峰Original
2017-03-25 13:39:535233browse

pandas is the most famous data statistics package in the python environment, and DataFrame is translated as data frame, which is a way of organizing data. This article mainly introduces you to the summation of rows and columns in pandas.DataFrame in python. Add a new row and column sample code. The article provides detailed sample code. Friends in need can refer to it. Let's take a look together.

This article introduces the relevant information about summing rows and columns and adding new rows and columns in pandas.DataFrame in python. I won’t say much below, let’s take a look at the detailed introduction.

The method is as follows:

Import module:

from pandas import DataFrame
import pandas as pd
import numpy as np

Generate DataFrame data

df = DataFrame(np.random.randn(4, 5), columns=['A', 'B', 'C', 'D', 'E'])

DataFrame data preview:

  A  B  C  D  E
0 0.673092 0.230338 -0.171681 0.312303 -0.184813
1 -0.504482 -0.344286 -0.050845 -0.811277 -0.298181
2 0.542788 0.207708 0.651379 -0.656214 0.507595
3 -0.249410 0.131549 -2.198480 -0.437407 1.628228

Calculate the sum of the data in each column and add it to the end as a new column

df['Col_sum'] = df.apply(lambda x: x.sum(), axis=1)

Calculate the sum of the data in each row and add it to the end as a new row

df.loc['Row_sum'] = df.apply(lambda x: x.sum())

Final data result:

  A  B  C  D  E Col_sum
0 0.673092 0.230338 -0.171681 0.312303 -0.184813 0.859238
1 -0.504482 -0.344286 -0.050845 -0.811277 -0.298181 -2.009071
2 0.542788 0.207708 0.651379 -0.656214 0.507595 1.253256
3 -0.249410 0.131549 -2.198480 -0.437407 1.628228 -1.125520
Row_sum 0.461987 0.225310 -1.769627 -1.592595 1.652828 -1.022097

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Detailed explanation of pandas.DataFrame in python to exclude specific rows sample code

pandas.DataFrame in python (creation, indexing, addition and deletion) Introduction to simple operation methods

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