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')