Python Pandas - 将 CategoricalIndex 的类别设置为有序


若要将 CategoricalIndex 的类别设置为有序,请在 Pandas 中使用 as_ordered() 方法。

首先,导入所需的库 -

import pandas as pd

使用 "categories" 参数为类别设置类别 -

catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], categories=["p", "q", "r", "s"])

获取类别 -

print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)

将类别设置为有序 -

print("\nCategoricalIndex ordered...\n", catIndex.as_ordered())

以下是代码 -

import pandas as pd

# Set the categories for the categorical using the "categories" parameter
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], categories=["p", "q", "r", "s"])

# Display the CategoricalIndex
print("CategoricalIndex...\n",catIndex)

# Get the categories
print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)

# Set the categories to be ordered
print("\nCategoricalIndex ordered...\n", catIndex.as_ordered())

输出

这将生成以下输出 -

CategoricalIndex...
CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=False, dtype='category')

Displaying Categories from CategoricalIndex...
Index(['p', 'q', 'r', 's'], dtype='object')

CategoricalIndex ordered...
CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=True, dtype='category')

更新于: 18-Oct-2021

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