Python Pandas - 将 CategoricalIndex 的类别设置为有序
若要将 CategoricalIndex 的类别设置为有序,请在 Pandas 中使用 as_ordered() 方法。
首先,导入所需的库 -
import pandas as pd
使用 "categories" 参数为类别设置类别 -
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], categories=["p", "q", "r", "s"])
获取类别 -
print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)
将类别设置为有序 -
print("\nCategoricalIndex ordered...\n", catIndex.as_ordered())例
以下是代码 -
import pandas as pd
# Set the categories for the categorical using the "categories" parameter
catIndex = pd.CategoricalIndex(["p", "q", "r", "s","p", "q", "r", "s"], categories=["p", "q", "r", "s"])
# Display the CategoricalIndex
print("CategoricalIndex...\n",catIndex)
# Get the categories
print("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)
# Set the categories to be ordered
print("\nCategoricalIndex ordered...\n", catIndex.as_ordered())输出
这将生成以下输出 -
CategoricalIndex... CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=False, dtype='category') Displaying Categories from CategoricalIndex... Index(['p', 'q', 'r', 's'], dtype='object') CategoricalIndex ordered... CategoricalIndex(['p', 'q', 'r', 's', 'p', 'q', 'r', 's'], categories=['p', 'q', 'r', 's'], ordered=True, dtype='category')
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