import json
import matplotlib.pyplot as plt

plt.rcParams['font.sans-serif'] = ['SimHei']
plt.rcParams['axes.unicode_minus'] = False

with open('simulated-examination/q2_1_crawler/movies.json', 'r', encoding='utf-8') as f:
    movies = json.load(f)

durations = [m['duration'] for m in movies]

plt.figure()
plt.hist(durations, bins=5, color='green')
plt.title("时长分布")
plt.xlabel("时长（分钟）")
plt.savefig('q4_3b_hist.png', dpi=150)