Python Pandas - 將 CategoricalIndex 的類別設定為有序


若要將 CategoricalIndex 的類別設定為有序,請在 Pandas 中使用 as_ordered() 方法。

首先,匯入所需的庫 -

import pandas as pd

使用 "categories" 引數為類別設定類別 -

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

獲取類別 -

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

將類別設定為有序 -

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

以下是程式碼 -

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())

輸出

這將生成以下輸出 -

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')

更新於: 18-Oct-2021

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