在plotly python中如何在所有子图中添加水平线

Question

我想在绘图生成的每个子图中添加0.09 and -0.09处的水平线。下面是我的代码。在

  trace1 = go.Scatter(
    x=df1['transaction_date'],
    y=df1['difference'],
    )
  trace2 = go.Scatter(
    x=df2['transaction_date'],
    y=df2['difference'],
)

 trace3 = go.Scatter(
   x=df3['transaction_date'],
   y=df3['difference'],

 )
 trace4 = go.Scatter(
   x=df4['transaction_date'],
   y=df4['difference'],

 )

 fig = tools.make_subplots(rows=2, cols=2,subplot_titles=('DF1 HS', DF2 HSD',
                                                     'DF3 HD', 'DF4 SD',
                                                     ))

 fig.append_trace(trace1, 1, 1)
 fig.append_trace(trace2, 1, 2)
 fig.append_trace(trace3, 2, 1) 
 fig.append_trace(trace4, 2, 2)

然后我想将这4个子块保存为jpeg在磁盘上。我如何在python中做到这一点

Answer 1

尝试用shapes更新fig对象的layout，如下所示：

import plotly.graph_objs as go
from plotly import tools
from plotly.offline import init_notebook_mode, plot

df = pd.DataFrame(np.random.randint(0,100,size=(20,2)),
                  index=pd.date_range(start='2018-08-21',end='2018-09-09'),
                  columns=['A','B'])

trace1 = go.Scatter(x=df.index,y=df['A'],)
trace2 = go.Scatter(x=df.index,y=df['B'],)

fig = tools.make_subplots(rows=2, cols=1,subplot_titles=(['A','B']))

fig.append_trace(trace1, 1, 1)
fig.append_trace(trace2, 2, 1)

fig['layout'].update(shapes=[{'type': 'line','y0':50,'y1': 50,'x0':str(df.index[0]), 
                              'x1':str(df.index[-1]),'xref':'x1','yref':'y1',
                              'line': {'color': 'red','width': 2.5}},
                             {'type': 'line','y0':50,'y1': 50,'x0':str(df.index[0]), 
                              'x1':str(df.index[-1]),'xref':'x2','yref':'y2',
                              'line': {'color': 'red','width': 2.5}}])

plot(fig,show_link=False,image='jpeg',image_filename='Temp_plot')

绘图将保存为Temp_plot.jpeg。请检查下面的图片。

这种方法的缺点是我们需要小心地给xref和{}相对于子批次的轴值。在