Python Pandas - 获取请求标签的整数位置,如果未找到精确匹配则查找前一个索引值


要获取请求标签的整数位置,如果未找到精确匹配则查找前一个索引值,请使用 **index.get_loc()**。将参数 **method** 设置为值 **ffill**。

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)

如果未找到精确匹配,则获取前一个索引的位置。使用 get_loc() 的“method”参数将值设置为“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)

# 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"))

输出

这将产生以下输出 -

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

Number of elements in the index...
7

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

更新于: 2021-10-14

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