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 CategoricalIndex 的 codes 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]
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