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Pandas DataFrame reset_index() 方法

❮ DataFrame 参考


示例

将索引重置回 0、1、2

import pandas as pd

data = {
  "name": ["Sally", "Mary", "John"],
  "age": [50, 40, 30],
  "qualified": [True, False, False]
}
idx = ["X", "Y", "Z"]

df = pd.DataFrame(data, index=idx)

newdf = df.reset_index()

print(newdf)
自己尝试 »

定义和用法

reset_index() 方法允许您将索引重置回默认的 0、1、2 等索引。

默认情况下,此方法会将“旧”索引保存在名为“index”的列中,要避免这种情况,请使用 drop 参数。


语法

dataframe.reset_index(level, drop, inplace, col_level, col_fill)

参数

这些参数是 关键字参数

参数 描述
level 整数
字符串
列表
元组
可选。指定要重置的级别。默认情况下重置所有级别
drop True
False
可选。默认为 False
inplace True
False
可选,默认为 False。如果为 True:则在当前 DataFrame 上执行操作。如果为 False:则返回执行操作的副本。
col_level 整数
字符串
可选,默认为 0。对于多级列,指定在哪个级别重置索引
col_fill 对象
None
可选,默认为 ''。对于多级列,指定其他级别如何被索引

返回值

带有结果的 DataFrame,如果 inplace 参数设置为 True,则返回 None。

此函数不会对原始 DataFrame 对象进行更改。


❮ DataFrame 参考

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