Python Pandas - 從 CategoricalIndex 中移除指定的分組
要從 CategoricalIndex 中移除指定的類別,請在 Pandas 中使用 remove_categories() 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,使用 "ordered" 引數將類別視為有序 −
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"])
使用 remove_categories() 移除類別,將要移除的類別作為引數進行設定。原本屬於已被移除類別的值將被設為 NaN −
print("\nCategoricalIndex after removing specified categories...\n",
catIndex.remove_categories(["p", "q"]))示例
以下為程式碼示例 −
import pandas as pd
# Set the categories for the categorical using the "categories" parameter
# 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)
# Remove categories using remove_categories()
# Set the categories to be removed as a parameter
# Values which were in the removed categories will be set to NaN
print("\nCategoricalIndex after removing specified categories...\n",
catIndex.remove_categories(["p", "q"]))輸出
這將產生以下輸出結果 −
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 removing specified categories... CategoricalIndex([nan, nan, 'r', 's', nan, nan, 'r', 's'], categories=['r', 's'], ordered=True, dtype='category')
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