Seaborn pairplot hue parameter not working as expected

Question

If "C" was assigned as value for the "hue" parameter, it was expected Seaborn not displayed column "C". Am I wrong?

sns.pairplot(df, hue='C')

DataFrame:

Answer 1

By default, seaborn will show all numeric columns!

So if your 'hue' column ('C' in your case) column as string(object) type, it will not be visible on the graph

For instance:

import numpy as np
import pandas as pd
import seaborn as sns

data = {
    'A': [*np.random.random(5)],
    'B': [*np.random.random(5)],
    'C': ['X', 'Y', 'X', 'X', 'Y']
}

df = pd.DataFrame(data)

sns.set(style="ticks", color_codes=True)
sns.pairplot(df, hue='C')

However, if you have 'C' column as the numerical values, you have to use 'vars' to specify what columns you are going to use:

vars : list of variable names, optional

Variables within data to use, otherwise use every column with a numeric datatype.

data = {
    'A': [*np.random.random(5)],
    'B': [*np.random.random(5)],
    'C': [*np.random.randint(1, 3, 5)]
}

df = pd.DataFrame(data)

sns.set(style="ticks", color_codes=True)
sns.pairplot(df, hue='C', vars=['A', 'B'])