Python Pandas 二元類別索引 - 使用類似字典的新類別重新命名類別
要使用類似字典的新類別重新命名類別,請在 Pandas 中使用 CategoricalIndex rename_categories() 方法。
首先,匯入所需的庫 −
import pandas as pd
CategoricalIndex 只能採用有限且通常是固定數量的可能值。使用“ordered”引數將分類視為有序 −
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"])
顯示 CategoricalIndex −
print("CategoricalIndex...\n",catIndex)重新命名類別。設定將替換舊類別的新類似字典的類別
print("\nCategoricalIndex after renaming categories...\n",catIndex.rename_categories({'p': 5, 'q': 10, 'r': 15, 's': 20}))
示例
以下為程式碼 −
import pandas as pd
# CategoricalIndex can only take on a limited, and usually fixed, number of possible values
# Treat the categorical as ordered using the "ordered" parameter
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"])
# Display the CategoricalIndex
print("CategoricalIndex...\n",catIndex)
# Get the categories
print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)
# Rename categories
# Set the new dict-like categories that will replace the old categories
print("\nCategoricalIndex after renaming categories...\n",
catIndex.rename_categories({'p': 5, 'q': 10, 'r': 15, 's': 20}))輸出
這將產生以下輸出 −
CategoricalIndex... CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=True, dtype='category') Displaying Categories from CategoricalIndex... Index(['p', 'q', 'r', 's'], dtype='object') CategoricalIndex after renaming categories... CategoricalIndex([5, 10, 15, 20, 5, 10, 15, 20], categories=[5, 10, 15, 20], ordered=True, dtype='category')
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