Python Pandas - 如果索引中所有标签都比已传递标签晚,则从索引返回标签


要从索引中返回标签(如果索引中的所有标签都比已传递的标签晚),请在 Pandas 中使用 index.asof() 方法。

首先,导入必需的库 -

import pandas as pd

创建 Pandas 索引 -

index = pd.Index([10, 20, 30, 40, 50, 60, 70])

显示 Pandas 索引 -

print("Pandas Index...\n",index)

从索引中返回标签。如果索引中的所有标签都比已传递的标签晚,则返回 NaN -

print("\nGet the label from the index...\n",index.asof(6))

示例

以下是代码 -

import pandas as pd

# Creating Pandas index
index = pd.Index([10, 20, 30, 40, 50, 60, 70])

# Display the Pandas index
print("Pandas Index...\n",index)

# Return the number of elements in the Index
print("\nNumber of elements in the index...\n",index.size)

# Return the label from the index
# Returns NaN when if all of the labels in the index are later than the passed label
print("\nGet the label from the index...\n",index.asof(6))

输出

这将生成以下输出 -

Pandas Index...
Int64Index([10, 20, 30, 40, 50, 60, 70], dtype='int64')

Number of elements in the index...
7

Get the label from the index...
Nan

更新于: 14-10-2021

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