Violin with Quartiles

import matplotlib.pyplot as plt
import numpy as np

# Data
np.random.seed(42)
groups = ['Segment A', 'Segment B', 'Segment C', 'Segment D']
data = [np.random.gamma(3, 1, 300) + 2,
        np.random.normal(6, 1.5, 300),
        np.random.exponential(2, 300) + 3,
        np.random.normal(5, 2, 300)]

# Colors
colors = ['#8B5CF6', '#6366F1', '#3B82F6', '#0EA5E9']

# Create figure
fig, ax = plt.subplots(figsize=(10, 6), facecolor='white')

vp = ax.violinplot(data, positions=range(len(data)), widths=0.7,
                   showmeans=False, showmedians=False, showextrema=False)

for i, body in enumerate(vp['bodies']):
    body.set_facecolor(colors[i])
    body.set_edgecolor('white')
    body.set_linewidth(1.5)
    body.set_alpha(0.7)

# Add quartile lines
for i, d in enumerate(data):
    q1, median, q3 = np.percentile(d, [25, 50, 75])
    
    # Quartile lines
    ax.hlines([q1, q3], i - 0.15, i + 0.15, color=colors[i], linewidth=2)
    
    # Median line (thicker)
    ax.hlines(median, i - 0.2, i + 0.2, color='white', linewidth=3)
    ax.hlines(median, i - 0.18, i + 0.18, color=colors[i], linewidth=2)
    
    # IQR connecting line
    ax.vlines(i, q1, q3, color=colors[i], linewidth=2)

# Customize axes
ax.set_xticks(range(len(groups)))
ax.set_xticklabels(groups, fontsize=11, fontweight='500')
ax.set_ylabel('Value Distribution', fontsize=12, fontweight='500', color='#374151')

# Clean styling
ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)
ax.spines['left'].set_color('#E5E7EB')
ax.spines['bottom'].set_color('#E5E7EB')
ax.tick_params(colors='#6B7280', labelsize=10)
ax.yaxis.grid(True, linestyle='--', alpha=0.3, color='#9CA3AF')

plt.tight_layout()
plt.show()