Python Pandas - 返回 MultiIndex 中请求级别的标签值向量
要返回MultiIndex中请求级别的标签值向量，请使用该方法。将级别名称设置为参数。multiIndex.get_level_values()
首先，导入所需的库-
import pandas as pd
MultiIndex是Pandas对象的多级或分层索引对象-
multiIndex = pd.MultiIndex.from_arrays([list('pqrrss'), list('strvwx')],names=['One', 'Two'])显示多索引-
print("The MultiIndex...\n",multiIndex)获取MultiIndex中的级别-
print("\nThe levels in MultiIndex...\n",multiIndex.levels)获取级别0的级别值-
print("\nLevel values...\n",multiIndex.get_level_values(0))示例
以下是代码-
import pandas as pd
#MultiIndexisamulti-level,orhierarchical,indexobjectforpandasobjects
multiIndex = pd.MultiIndex.from_arrays([list('pqrrss'), list('strvwx')],names=['One', 'Two'])
#displaytheMultiIndex
print("The MultiIndex...\n",multiIndex)
#getthelevelsinMultiIndex
print("\nThe levels in MultiIndex...\n",multiIndex.levels)
#getlevelvaluesatlevel0
print("\nLevel values...\n",multiIndex.get_level_values(0))
# get level values with level name "Two"
print("\nLevel values...\n",multiIndex.get_level_values("Two"))输出结果这将产生以下输出-
The MultiIndex...
MultiIndex([('p', 's'),
('q', 't'),
('r', 'r'),
('r', 'v'),
('s', 'w'),
('s', 'x')],
names=['One', 'Two'])
The levels in MultiIndex...
[['p', 'q', 'r', 's'], ['r', 's', 't', 'v', 'w', 'x']]
Level values...
Index(['p', 'q', 'r', 'r', 's', 's'], dtype='object', name='One')
Level values...
Index(['s', 't', 'r', 'v', 'w', 'x'], dtype='object', name='Two')