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Manage markers for lineplots with Python seaborn

Setup

# Import libraries
import pandas as pd
import seaborn as sns
import numpy as np

# Set plots size
sns.set(rc={'figure.figsize':(12,7)})

# Load sample data
df = (
    sns.load_dataset('flights')
    .loc[lambda x: x['year'] > 1956]
    .reset_index(drop=True)    
)

Same marker for all lines

To use the same marker style for all lines on the plot, set the marker argument (without a final s).

# Line plot with the same marker for all categories
sns.lineplot(
		data=df, x='month', y='passengers', 
		hue='year', marker='o'
);
image

Different markers by line

To plot different markers for each line, without specifying the style, set style to the grouping variable and set markers (with a final s) to True.

# Line plot with a different marker for each category
sns.lineplot(
		data=df, x='month', y='passengers', 
		style='year', markers=True
);
image

It is also possible to specify the markers styles by passing a list. To avoid incompatibilities between the line and the markers style, set dashes to False.

# Specify the markers style for each category
sns.lineplot(
		data=df, x='month', y='passengers', 
		style='year', dashes=False, markers=['o', 'v', 'X', 'd']
);
image