Python Pandas CategoricalIndex - 获取此分类的类别代码


若要获取此分类的类别代码,请在 Pandas 中使用 CategoricalIndexcodes 属性。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的许多可能值(类别)。使用 "categories" 参数为分类设置类别。使用 "ordered" 参数将 分类标记为有序。代码是整数数组,它们是类别数组中实际值的位置 −

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("Categorical Index...\n",catIndex)

获取类别代码 −

print("\nCategory codes from CategoricalIndex...\n",catIndex.codes)

示例

以下为代码 −

import pandas as pd

# CategoricalIndex can only take on a limited, and usually fixed, number of possible values
# Set the categories for the categorical using the "categories" parameter
# Treat the categorical as ordered using the "ordered" parameter
# Codes are an array of integers which are the positions of the actual values in the categories array.
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"])

# Display the Categorical Index
print("Categorical Index...\n",catIndex)

# Get the categories
print("\nDisplayingCategories from CategoricalIndex...\n",catIndex.categories)

# Get the category codes
print("\nCategory codes from CategoricalIndex...\n",catIndex.codes)

输出

这将产生以下输出 −

Categorical Index...
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')

Category codes from CategoricalIndex...
[0 1 2 3 0 1 2 3]

更新于:18-Oct-2021

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