Python Pandas - 从 CategoricalIndex 中删除指定的类别

要从CategoricalIndex中删除指定的类别，请使用remove_categories()Pandas中的方法。

首先，导入所需的库-

import pandas as pd

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"])

使用删除类别remove_categories()。将要删除的类别设置为参数。已删除类别中的值将设置为NaN-

print("\nCategoricalIndex after removing specified categories...\n", catIndex.remove_categories(["p", "q"]))

示例

以下是代码-

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"]) #显示分类索引 print("CategoricalIndex...\n",catIndex) #获取类别 print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories) #使用remove_categories()删除类别 #设置要删除的类别作为参数 #已删除类别中的值将设置为NaN print("\nCategoricalIndex after removing specified categories...\n", catIndex.remove_categories(["p", "q"]))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) 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)