Python Pandas - 获取 MultiIndex 中的代码(每个标签的位置)
要获取 MultiIndex 中的代码(每个标签的位置),请使用 Pandas 中的 MultiIndex.codes 属性。首先,导入必需的库 −
import pandas as pd
MultiIndex 是 pandas 对象的多级或层次索引对象。创建数组 −
arrays = [[1, 2, 3, 4, 5], ['John', 'Tim', 'Jacob', 'Chris', 'Keiron']]
“names”参数设置各索引级别的名称:from_arrays() 用于创建 Multiindex −
multiIndex = pd.MultiIndex.from_arrays(arrays, names=('ranks', 'student'))
获取 Multiindex 中每个标签的位置 −
print("\nThe location of each label in Multi-index...\n",multiIndex.codes)
示例
以下是代码 −
import pandas as pd # MultiIndex is a multi-level, or hierarchical, index object for pandas objects # Create arrays arrays = [[1, 2, 3, 4, 5], ['John', 'Tim', 'Jacob', 'Chris', 'Keiron']] # The "names" parameter sets the names for each of the index levels # The from_arrays() is used to create a Multiindex multiIndex = pd.MultiIndex.from_arrays(arrays, names=('ranks', 'student')) # display the Multiindex print("The Multi-index...\n",multiIndex) # get the levels in Multiindex print("\nThe levels in Multi-index...\n",multiIndex.levels) # get the location of each label in Multiindex print("\nThe location of each label in Multi-index...\n",multiIndex.codes)
输出
这将生成以下输出 −
The Multi-index... MultiIndex([(1, 'John'), (2, 'Tim'), (3, 'Jacob'), (4, 'Chris'), (5, 'Keiron')], names=['ranks', 'student']) The levels in Multi-index... [[1, 2, 3, 4, 5], ['Chris', 'Jacob', 'John', 'Keiron', 'Tim']] The location of each label in Multi-index... [[0, 1, 2, 3, 4], [2, 4, 1, 0, 3]]
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