Python Pandas - 获取 MultiIndex 的级别
若要获取 MultiIndex 中的级别,请使用 Pandas 中的 MultiIndex.levels 属性。首先,导入所需的库:
import pandas as pd
MultiIndex 是 pandas 对象的多层次(或分层)索引对象。创建数组:
arrays = [[1, 2, 3, 4, 5], ['John', 'Tim', 'Jacob', 'Chris', 'Keiron']]
"names" 参数为索引的每个级别设置名称。from_arrays() 用于创建 Multiindex:
multiIndex = pd.MultiIndex.from_arrays(arrays, names=('ranks', 'student'))
在 Multiindex 中获取级别:
print("\nThe levels in Multi-index...\n",multiIndex.levels)
示例
以下为该代码:
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() uis 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)
输出
这将产生以下输出:
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']]
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