How to add error_y to fig.add_scatter in plotly?-CodePudding

How to add error_y to fig.add_scatter, please? The argument error_y does not work for fig.add_scatter, unlike px.scatter. I did not find any appropriate argument in the documentation provided I looked carefully. Does it exist?

import plotly.express as px
import numpy as np
import pandas as pd
import plotly.graph_objects as go

with open("file", "w") as f:
    f.write("""1       27  10  20.10.2021
2       10  11  21.10.2021
3       10  2   28.10.2021    
4       13  8   05.11.2021
5       17  5   17.11.2021""")

datum = np.loadtxt("file", unpack=True, dtype="str", usecols=[3])
cislo, K, H = np.loadtxt("file", unpack=True, usecols=[0, 1, 2])

d = {"Datum": datum, "B": K, "C": H, "cislo": cislo}
df = pd.DataFrame(data=d)

fig = px.scatter(df, x=[-100], y=[100], error_y=[10])  

# How to add error_y to fig.add_scatter?
fig.add_scatter(
    x=df["cislo"],
    y=df["C"],
    customdata=df["Datum"].values.reshape([len(df), 1]),
    hoverinfo="skip",
    mode="markers",
    marker=dict(size=10, color="Purple"),
    name="C",
)

fig.add_scatter(
    x=df["cislo"],
    y=df["B"],
    customdata=df["Datum"].values.reshape([len(df), 1]),
    hoverinfo="skip",
    mode="markers",
    marker=dict(size=10, color="Green"),
    name="B",
)

fig.update_traces(
    hovertemplate="<br>".join(
        [
            "<b>Value:</b>       %{y:.0f}",
            "<b>Date:</b>              %{customdata[0]}",
        ]
    )
)
fig.update_traces(mode="lines markers")

fig.show()

CodePudding user response：

This is covered in the documentation: