Python Pandas - 创建一个以 MultiIndex 的级别为列的 DataFrame
要创建以 MultiIndex 级别为列的 DataFrame,请使用to_frame()Pandas 中的方法。
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。创建数组 -
arrays = [[1, 2, 3, 4], ['John', 'Tim', 'Jacob', 'Chris']]
“names”参数设置每个索引级别的名称。将from_arrays()被用来创建一个多指标-
multiIndex = pd.MultiIndex.from_arrays(arrays, names=('ranks', 'student'))
使用 MultiIndex 的级别作为列创建一个 DataFrame to_frame()-
dataFrame = multiIndex.to_frame()
示例
以下是代码 -
import pandas as pd输出结果# MultiIndex is a multi-level, or hierarchical, index object for pandas objects
# Create arrays
arrays = [[1, 2, 3, 4], ['John', 'Tim', 'Jacob', 'Chris']]
# 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)
# Create a DataFrame with the levels of the MultiIndex as columns using to_frame()
dataFrame = multiIndex.to_frame()
# Display the DataFrame
print("\nThe DataFrame...\n",dataFrame)
这将产生以下输出 -
The Multi-index...MultiIndex([(1, 'John'),
(2, 'Tim'),
(3, 'Jacob'),
(4, 'Chris')],
names=['ranks', 'student'])
The levels in Multi-index...
[[1, 2, 3, 4], ['Chris', 'Jacob', 'John', 'Tim']]
The DataFrame...
ranks student
ranks student
1 John 1 John
2 Tim 2 Tim
3 Jacob 3 Jacob
4 Chris 4 Chris
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