複数ラインの推移比較

import matplotlib.pyplot as plt

weeks = ["W1", "W2", "W3", "W4", "W5"]
east = [180, 150, 170, 140, 160]
west = [120, 130, 140, 125, 135]

fig, ax = plt.subplots(figsize=(6, 4))

ax.plot(weeks, east, marker="o", linewidth=2.5, color="#2563eb", label="東エリア")
ax.plot(weeks, west, marker="o", linewidth=2.5, color="#10b981", label="西エリア")

ax.set_ylabel("売上（万円）")
ax.set_title("週別 売上推移")
ax.grid(axis="y", alpha=0.3)
ax.legend(frameon=False, loc="lower right")

fig.tight_layout()

plt.show()