Menu
×
   ❮     
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS R TYPESCRIPT ANGULAR GIT POSTGRESQL MONGODB ASP AI GO KOTLIN SASS VUE DSA GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE
     ❯   

Pandas DataFrame count() 方法

❮ DataFrame 参考


示例

计算每行中(非空)值的个数

import pandas as pd

data = {
  "Duration": [50, 40, None, None, 90, 20],
  "Pulse": [109, 140, 110, 125, 138, 170]
}

df = pd.DataFrame(data)

print(df.count())
亲自试一试 »

定义和用法

The count() 方法计算每行或每列(如果将 axis 参数指定为 axis='columns')中非空值的个数,并返回一个 Series 对象,其中包含每行(或每列)的结果。


语法

dataframe.count(axis, level, numeric_only)

参数

axis level numeric_only 参数是 关键字参数

参数 描述
axis 0
1
'index'
'columns'
可选,检查哪个轴,默认为 0。
level 数字
层级名称
可选,指定要沿其计数的层级(在分层多索引中)。
numeric_only 'True'
'False'
可选,默认为 False,如果 count 方法应仅计算数值,则设置为 True。

 返回值

一个 Series 对象,包含每行/每列的计数结果。

如果指定了 level 参数,则此方法将返回一个 DataFrame 对象。

此函数不会更改原始 DataFrame 对象。


❮ DataFrame 参考

×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
[email protected]

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
[email protected]

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2024 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.