How to set the line color in Python Plotly?

Python Plotly has features that you can use to set the line color in a graph. In this tutorial, let us understand how to set the line color in Plotly.

Here, we will use plotly.express to generate the figures. It contains a lot of methods to customize the charts and render a chart in HTML format.

To set the line color, we will use the update_traces() method and set line_color with color values.

Follow the steps given below to set the line color.

Step 1

Import plotly.express module and alias as px.

import plotly.express as px

Step 2

Create a dataframe as shown below ?

import pandas as pd
data = {'mark':[12,13,11,14,15], 'avg':[5,6,5,7,8]}
df = pd.DataFrame(data)

Step 3

Create a line plot with the following coordinates ?

fig = px.line(df, df['mark'], df['avg'])

Step 4

Use the update_traces() method to set line color as "purple". Similarly, you can assign other different colors as well.

fig.update_traces(line_color='purple')

Example

Here is the complete code to set the line color in Python Plotly ?

import plotly.express as px
import pandas as pd

data = {'mark':[12,13,11,14,15], 'avg':[5,6,5,7,8]}
df = pd.DataFrame(data)

fig = px.line(df, df['mark'], df['avg'])
fig = px.scatter(width=716, height=400)
fig.update_traces(line_color='purple')

fig.show()

Output

It will show the following output on the browser ?

Observe that here we have used the line_color attribute of the update_traces() method to set the line color as "purple". You can choose other colors too and also, you can use the line_width attribute to set the width of a line on the graph.