使用 Pandas 按組繪制線條

Question

我試圖通過從外部手動傳遞顏色來繪制列中的值並根據不同列中的組為它們着色。 我將藍色分配給測試，紅色分配給訓練組。 但以下代碼僅以藍色繪制值。

import datetime
import pandas as pd

dft2 = pd.DataFrame({'A': [1,3,3,4,1,3,3,4],
                    'B': [2015, 2016, 2017,2018, 2019, 2020, 2021, 2022],
                    'C': pd.Categorical(["test", "train", "test", "train","train","train","train","train"])})

dft2 = dft2.set_index('B')
colors = {'test': 'b', 'train': 'r'}
dft2['A'].plot(figsize=(24,3),  rot=90, color=[colors[i] for i in dft2['C']])

Answer 1

您可能需要散點圖版本

import datetime
import pandas as pd


dft2 = pd.DataFrame({'A': [1,3,3,4],
                'B': [2015, 2016, 2017,2018],
                'C': pd.Series(1, index=list(range(4)), dtype='float32'),
                'D': np.array([3] * 4, dtype='int32'),
                'E': pd.Categorical(["test", "train", "test", "train"]),
                'F': 'foo'})

dft2.plot.scatter(x='B',y='A',c=['b' if i== 'test' else 'r'  for i in dft2['E']])