Python Pandas - 从有序类别索引中获取最大值
要从有序类别索引中获取最大值,请在 Pandas 中使用 catIndex.max() 方法。
首先,导入必需的库 −
import pandas as pd
使用“categories”参数设置类别类别的,使用“ordered”参数将类别视为有序类别 −
catIndex = pd.CategoricalIndex( ["p", "q", "r", "s","p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"] )
显示类别索引 −
print("Categorical Index...\n",catIndex)获取最大值 −
print("\nMaximum value from CategoricalIndex...\n",catIndex.max())示例
以下是代码 −
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
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("\nDisplaying Categories from CategoricalIndex...\n",catIndex.categories)
# Get the max value
print("\nMaximum value from CategoricalIndex...\n",catIndex.max())输出
将生成以下输出 −
Categorical Index... 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') Maximum value from CategoricalIndex... S
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