Python Pandas CategoricalIndex - 类似于 dict 一样使用输入对应关系映射值
要使用类似于 dict 的输入对应关系映射值,请在 Pandas 中使用 CategoricalIndex.map() 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" 参数将分类视为有序的 −
catIndex = pd.CategoricalIndex(["P", "Q", "R", "S","P", "Q", "R", "S"], ordered=True, categories=["P", "Q", "R", "S"])
显示 CategoricalIndex −
print("CategoricalIndex...\n",catIndex)
映射类别 −
print("\nCategoricalIndex after mapping...\n",catIndex.map({'P': 5, 'Q': 10, 'R': 15, 'S': 20}))
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"]) # Display the CategoricalIndex print("CategoricalIndex...\n",catIndex) # Get the categories print("\nDisplayingCategories from CategoricalIndex...\n",catIndex.categories) # Map categories print("\nCategoricalIndex after mapping...\n",catIndex.map({'P': 5, 'Q': 10, 'R': 15, 'S': 20}))
输出
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 mapping... CategoricalIndex([5, 10, 15, 20, 5, 10, 15, 20], categories=[5, 10, 15, 20], ordered=True, dtype='category')
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