import json
import matplotlib.pyplot as plt

movies = json.load(open('movies.json', encoding='utf-8'))['movies']
# print(movies)
ratings = []
durations = []
for m in movies:
    ratings.append(m['rating'])
    durations.append(m['duration'])

plt.figure(figsize=(8,5))
plt.scatter(durations,ratings,color='red',alpha=0.6)
plt.title('时长与评分关系散点图')
plt.xlabel('duration')
plt.ylabel('rating')
plt.savefig('q4_2_scatter.png', dpi=150)