グループ化棒グラフ

import numpy as np
import matplotlib.pyplot as plt

months = ["Jan", "Feb", "Mar", "Apr"]
online = np.array([120, 140, 155, 170])
store = np.array([90, 105, 110, 120])
width = 0.35
x = np.arange(len(months))

fig, ax = plt.subplots(figsize=(6, 4))
ax.bar(x - width / 2, online, width, label="オンライン", color="#3b82f6")
ax.bar(x + width / 2, store, width, label="店舗", color="#f59e0b")

ax.set_xticks(x, months)
ax.set_ylabel("売上（百万円）")
ax.set_title("チャネル別売上の推移")
ax.legend()
ax.grid(axis="y", alpha=0.2)

fig.tight_layout()

plt.show()