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Pandas DataFrame join() 方法

❮ DataFrame 参考


示例

将一个 DataFrame 的内容添加到另一个 DataFrame 中

import pandas as pd

data1 = {
  "name": ["Sally", "Mary", "John"],
  "age": [50, 40, 30]
}

data2 = {
  "qualified": [True, False, False]
}

df1 = pd.DataFrame(data1)
df2 = pd.DataFrame(data2)

newdf = df1.join(df2)
自己尝试一下 »

定义和用法

The join() 方法插入来自另一个 DataFrame 或 Series 的列。


语法

dataframe.join(other, on, how, lsuffix, rsuffix, sort)

参数

joinonhowlsuffixrsuffixsort 参数是关键字参数

参数 描述
other   必需。DataFrame、Series 或 DataFrame 列表。
on 字符串
列表
可选。指定在哪个级别进行连接
how 'left'
'right'
'outer'
'inner'
可选。默认 'left'。指定使用哪个索引
lsuffix 字符串 可选。默认 ''。指定要为重叠列添加的字符串
rsuffix 字符串 可选。默认 ''。指定要为重叠列添加的字符串
sort True
False
可选。默认 False。指定是否按连接键对 DataFrame 进行排序

返回值

一个新的DataFrame,包含更新的结果。

此方法不会更改原始 DataFrame。


❮ DataFrame 参考

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