Python Pandas - 计算给定当前索引的新索引的索引器和掩码


要计算给定当前索引的新索引的索引器和掩码,请在 Pandas 中使用 index.get_indexer() 方法。

首先,导入所需的库 −

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)

计算索引器和掩码。用 -1 标记,因为它不在索引中 −

print("\nGet the indexes...\n",index.get_indexer([30, 40, 90, 100, 50]))

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)

# Compute indexer and mask
# Marked by -1, as it is not in index
print("\nGet the indexes...\n",index.get_indexer([30, 40, 90, 100, 50]))

输出

这会产生以下输出 −

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

Number of elements in the index...
7

Get the indexes...
[ 2 3 -1 -1 4]

更新于: 14-Oct-2021

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