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.hist(durations, bins=5,color='blue')
plt.savefig('q4_3b_hist.png',dpi=150)