How to show label names in pandas groupby histogram plot

Question

I can plot multiple histograms in a single plot using pandas but there are few things missing:

1. How to give the label.
2. I can only plot one figure, how to change it to layout=(3,1) or something else.
3. Also, in figure 1, all the bins are filled with solid colors, and its kind of difficult to know which is which, how to fill then with different markers (eg. crosses,slashes,etc)?

Here is the MWE:

import numpy as np
import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt

df = sns.load_dataset('iris')

df.groupby('species')['sepal_length'].hist(alpha=0.7,label='species')
plt.legend()

Output:

To change layout I can use by keyword, but can't give them colors

HOW TO GIVE DIFFERENT COLORS?

df.hist('sepal_length',by='species',layout=(3,1))
plt.tight_layout()

Gives:

Answer 1

You can resolve to groupby:

fig,ax = plt.subplots()

hatches = ('\\', '//', '..')         # fill pattern
for (i, d),hatch in zip(df.groupby('species'), hatches):
    d['sepal_length'].hist(alpha=0.7, ax=ax, label=i, hatch=hatch)

ax.legend()

Output: