Python Pandas - 返回索引中的唯一值


若要返回索引中的唯一值,请在 Pandas 中使用index.unique() 方法。首先,导入必需的库 -

import pandas as pd

创建 Pandas 索引 -

index = pd.Index([10, 50, 70, 10, 90, 50, 10, 30])

显示 Pandas 索引 -

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

从索引中获取唯一值。唯一值按出现顺序返回,这不进行排序 -

index.unique()

示例

以下是代码 -

import pandas as pd

# Creating Pandas index
index = pd.Index([10, 50, 70, 10, 90, 50, 10, 30])

# 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 dtype of the data
print("\nThe dtype object...\n",index.dtype)

# get the unique values from the index
# Unique values are returned in order of appearance, this does NOT sort
print("\nUnique values from the Index..\n", index.unique())

输出

将生成以下输出 -

Pandas Index...
Int64Index([10, 50, 70, 10, 90, 50, 10, 30], dtype='int64')

Number of elements in the index...
8

The dtype object...
int64

Unique values from the Index..
Int64Index([10, 50, 70, 90, 30], dtype='int64')

更新日期: 13-Oct-2021

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