Python Pandas - 返回 Index 对象中的唯一元素数


要返回 Index 对象中唯一元素的数量,请在 Pandas 中使用 index.nunique() 方法。首先,导入所需的库 −

import pandas as pd

创建 Pandas 索引 −

index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 30])

显示 Pandas 索引 −

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

获取索引中唯一值的数目 −

print("\nCount of unique values...\n",index.nunique())

示例

下面是代码 −

import pandas as pd

# Creating Pandas index
index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 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())

# Get the number of unique values in the index
print("\nCount of unique values...\n",index.nunique())

输出

将生成以下输出 −

Pandas Index...
Int64Index([50, 10, 70, 110, 90, 50, 110, 90, 30], dtype='int64')

Number of elements in the index...
9

The dtype object...
int64

Unique values from the Index..
Int64Index([50, 10, 70, 110, 90, 30], dtype='int64')

Count of unique values...
6

更新于: 13- 10- 2021

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