import json
arr = {'pc': ['c++', 'c'], 'internet': ['php', 'javascript']}
data = json.dumps(arr)
for key, value in json.loads(data).items():
print('key: {} value: {}'.format(key, value))
'''
run:
key: pc value: ['c++', 'c']
key: internet value: ['php', 'javascript']
'''