如何在 plotly subplots hoverlabel 中设置小数位？

Question

如果有人能帮我解决这个问题，我会很高兴：我使用 pandas 和 plotly express 创建了一个循环，它从用户选择的数据帧元组中创建了 n 个堆叠的子图。

源数据有10位小数，所以我设置

    pd.set_option('precision',10)

数据框显示了足够的小数精度，散点图有效，但我无法让悬停标签显示所有 10 位小数。我试着设置

    fig.update_layout(hoverlabel_namelength=-1)

但它只更改了悬停标签中的 X 轴参考，而不是 Y 轴（包含数字）。

谁能帮帮我？

非常感谢您！玛丽亚

这是我的源程序：

#import libraries

import tkinter as tk
import tkinter.filedialog
from pathlib import Path

import pandas as pd
import plotly.express as px
import plotly.graph_objects as go
from plotly.subplots import make_subplots
import numpy as np
pd.set_option('precision',10)

#select files into tuple 'datafiles' via tkinter

root = tkinter.Tk()
pathdir='/***/DSM_Exports/'

datafiles = tkinter.filedialog.askopenfilenames(parent=root,title='Choose a file', initialdir=pathdir)
datafiles = root.tk.splitlist(datafiles)

#prepare subplots template n rows, 1 column

fig = make_subplots(rows=len(datafiles), cols=1, shared_xaxes=True, vertical_spacing=0.01)

# set up loop to create subplot

for counter in range (0, len(datafiles)):  #Set up loop with length of datafiles tuple
    print(counter, datafiles[counter])

    # import file
    table=pd.read_csv(datafiles[counter], sep="\t", header=None)  

    pd.set_option('expand_frame_repr', False)

    # extract DSM cumulative dose column

    numrows = table.shape[0]+1
    print('Number of rows', numrows)

    DSMcml= table[[1,2,3]] #extract colulmns start time, end time and cumul dose
                       #double paranthesis!
    DSMcml= DSMcml.iloc[1:numrows] #cut column name

    DSMcml[2]= pd.to_datetime(DSMcml[2]) #convert to datetime endtime

    DSMcml[3]=DSMcml[3].str.replace(',','.') #change dot to comma in [3]
    DSMcml[3]=DSMcml[3].astype(float, errors = 'raise') #change [3] to float

    DSMcml= DSMcml[DSMcml[3]>=0].dropna() #>>remove lines with values <0

    fig_Xdata= DSMcml[2] #extract end times for X-axis
    fig_Ydata= DSMcml[3].round(10) #extract cumul dose for Y-axis
    
    tracename=Path(datafiles[counter]).stem

    fig.add_trace(
        go.Scatter(x=fig_Xdata, y=fig_Ydata, mode='lines', name=tracename),
        row=counter+1, col=1)
   
    fig.update_layout(title_text=datafiles[counter], hovermode='x unified', hoverlabel_namelength=-1)
    fig.update_xaxes(showspikes=True, spikecolor='green', spikesnap='cursor', spikemode='across', spikedash='solid')

counterstring=str(counter+1)   #set x-axis indicator for shared spike-line
fig.update_traces(xaxis='x'+counterstring) # set shared spike-line

fig.show()
```

Answer 1

您可以在添加跟踪时使用 hovertemplate：

fig.add_trace(go.Scatter(x=fig_Xdata, y=fig_Ydata, 
hovertemplate='%{y:.10f}', mode='lines', name=tracename), row=counter+1, col=1)

如何在 plotly subplots hoverlabel 中设置小数位？

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