Python Pandas CategoricalIndex - 重命名类别
要重命名类别，请使用rename_categories()Pandas中的CategoricalIndex方法。首先，导入所需的库-
import pandas as pd
CategoricalIndex只能采用有限且通常是固定数量的可能值。使用“categories”参数设置分类的类别。使用“ordered”参数按顺序处理分类-
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"])
重命名类别。设置将替换旧类别的新类别-
print("\nCategoricalIndex after renaming categories...\n",catIndex.rename_categories([5, 10, 15, 20]))示例
以下是代码-
import pandas as pd
#CategoricalIndex只能采用有限且通常是固定数量的可能值
# 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"])
#显示分类索引
print("CategoricalIndex...\n",catIndex)
#获取类别
print("\nDisplayingCategories from CategoricalIndex...\n",catIndex.categories)
#重命名类别
#设置将替换旧类别的新类别
print("\nCategoricalIndex after renaming categories...\n",catIndex.rename_categories([5, 10, 15, 20]))输出结果这将产生以下输出-
CategoricalIndex... CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=True, dtype='category') DisplayingCategories 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')