Python Pandas - 獲取請求標籤的整數位置,如果未找到精確匹配則查詢前一個索引值


要獲取請求標籤的整數位置,如果未找到精確匹配則查詢前一個索引值,請使用 **index.get_loc()**。將引數 **method** 設定為值 **ffill**。

首先,匯入所需的庫 -

import pandas as pd

建立 Pandas 索引 -

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

顯示 Pandas 索引 -

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

如果未找到精確匹配,則獲取前一個索引的位置。使用 get_loc() 的“method”引數將值設定為“ffill” -

print("\nGet the location of the previous index if no exact match...\n", index.get_loc(45, method="ffill"))

示例

以下是程式碼 -

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)

# get integer location from the given index
print("\nDisplay integer location from given index...\n",index.get_loc(20))
print("\nDisplay integer location from given index...\n",index.get_loc(50))

# Get the location of the previous index if no exact match
# The value is set "ffill" using the "method" parameter of the get_loc()
print("\nGet the location of the previous index if no exact match...\n", index.get_loc(45, method="ffill"))

輸出

這將產生以下輸出 -

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

Number of elements in the index...
7

Display integer location from given index...
1

Display integer location from given index...
4

Get the location of the previous index if no exact match...
3

更新於: 2021-10-14

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