如何使用matplotlib自定义甘特图并在图表上显示指示当前时间的垂直线？

Question

这是我的Python代码，基本上绘制了甘特图：

import pandas as pd
import random
from datetime import datetime
import matplotlib.dates as mdates
import matplotlib.pyplot as plt
%matplotlib inline
import math
plt.style.use('ggplot')

df = pd.read_csv('zpp00141_new.csv')

def timestr_to_num(timestr):
    return mdates.date2num(datetime.strptime('0' + timestr if timestr[1] == ':' else timestr, '%I:%M:%S %p'))

df.rename(columns={"Earl. start / time": "start", "Latest finish / time": "finish"}, inplace = True)

df['Operation/Activity'] = df['Operation/Activity'].astype(str)

fig, ax = plt.subplots(figsize=(10, 5))
operations = pd.unique(df['Operation/Activity'])
#df.assign(start=df['Earl. start / time'])
colors = plt.cm.tab10.colors  # get a list of 10 colors
colors *= math.ceil(len(operations) / (len(colors)))  # repeat the list as many times as needed
for operation, color in zip(operations, colors):
    for row in df[df['Operation/Activity'] == operation].itertuples():
        left = timestr_to_num(row.start)
        right = timestr_to_num(row.finish)
        ax.barh(operation, left=left, width=right - left, height=3, color=color)
ax.set_xlim(timestr_to_num('07:00:00 AM'), timestr_to_num('4:30:00 PM'))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M'))  # display ticks as hours and minutes
ax.xaxis.set_major_locator(mdates.HourLocator(interval=1))  # set a tick every hour
ax.set_xlabel('Time')
ax.set_ylabel('Operation')
plt.tight_layout()
plt.show()

您可以在所附图片上看到输出：Gantt Chart

我想在x轴上绘制一条与当前时间相对应的垂直直线。我试图将其添加到我的代码中以进行绘制，但是我不知道如何使其工作。我认为我的时间格式或类似内容可能存在问题：

plt.axvline(pd.Timestamp.now(),color='r')

非常感谢您在此问题上的协助。这是所需输出的图片，我希望我的绘图相似：Desired plot

[此外，我想在我的y轴“操作简短文本”中添加/附加另一个类别以及“操作/活动”＃，这样它不仅会显示操作编号，而且还会反映操作旁边。要了解我的数据是什么样子，请参见下文（第一行是标题）：

Operation short text,Operation/Activity,Earl. start / time,Latest finish / time
Mount right racks,0250,7:00:00 AM,9:22:00 AM
Mount right side motion unit carriage,0251,9:22:00 AM,10:30:00 AM
Mount left side motion unit carriage,0252,10:30:00 AM,11:17:00 AM
Install motion unit complete,0253,11:17:00 AM,1:01:00 PM
Move machine to next step + EPA,0254,1:01:00 PM,3:30:00 PM
Mount Left Racks,0200,7:00:00 AM,9:12:00 AM
Mount cable motor & Lubricate guide carr,0201,9:12:00 AM,9:44:00 AM
Mount suction components,0202,9:44:00 AM,11:04:00 AM
Mount extraction,0203,11:04:00 AM,12:34:00 PM
Mount temporary diamond plates,0204,12:34:00 PM,1:04:00 PM
Mount piping inside,0205,1:04:00 PM,1:44:00 PM
Move Machine to next step + EPA,0206,1:44:00 PM,3:30:00 PM

Answer 1

但是，在将辅助值添加到y轴值（操作简短文本）时，我仍然需要一些帮助”>