# q4/q4_3b/q4_3b.py
import json
import matplotlib.pyplot as plt

with open("../q2_1_crawler/movies.json", "r", encoding="utf-8") as f:
    data = json.load(f)
movies = data["movies"]
durations = [m["duration"] for m in movies]

# 直方图 bins=5 绿色
plt.hist(durations, bins=5, color="green")
plt.title("时长分布")
plt.xlabel("时长（分钟）")
plt.tight_layout()

plt.savefig("q4_3b_hist.png", dpi=150)
plt.show()