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Pandas DataFrame loc 属性

❮ DataFrame 参考


示例

返回 Mary 的年龄

import pandas as pd

data = [[50, True], [40, False], [30, False]]
label_rows = ["Sally", "Mary", "John"]
label_cols = ["age", "qualified"]

df = pd.DataFrame(data, label_rows, label_cols)
print(df.loc["Mary", "age"])
亲自尝试 »

定义和用法

loc 属性获取或设置指定标签的值。

使用标签指定行和列。

要访问多行,请使用双括号并指定标签,标签之间用逗号分隔

df.loc[["Sally", "John"]]

通过将列标签包含在另一个列表中来指定列

df.loc[["Sally", "John"], ["age", "qualified"]]

您还可以使用fromto标签(用冒号分隔)指定 DataFrame 的切片

df.loc["Sally": "John"]

;0

注意:切片时,fromto都包含在结果中。


语法

dataframe.loc[row, column)

参数

参数 描述
row 可选。一个标签或标签列表,指定行标签。

column 可选。一个标签或标签列表,指定列标签。


返回值

取决于输入

行和列都使用单个标签 ["Sally", "age"] 返回该单元格的内容。

一行使用单个标签 ["Sally"] 返回一个Pandas Series

标签列表 [["Sally", "Mary"]] 返回一个Pandas DataFrame


❮ DataFrame 参考

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