# q4/q4_2/q4_2.py
import json
import matplotlib.pyplot as plt

# 读取数据
with open("../q2_1_crawler/movies.json", "r", encoding="utf-8") as f:
    data = json.load(f)
movies = data["movies"]

# 提取x时长、y评分
duration = [m["duration"] for m in movies]
rating = [m["rating"] for m in movies]

# 散点图：红色，透明度0.6
plt.scatter(duration, rating, color="red", alpha=0.6)
plt.title("时长与评分关系散点图")
plt.xlabel("时长（分钟）")
plt.ylabel("评分")
plt.tight_layout()

plt.savefig("q4_2_scatter.png", dpi=150)
plt.show()